Google Chrome quietly installs 4GB AI model on user devices, raising privacy and consent questions

Chrome's 4GB AI model isn't new, but you're not wrong for being confused

All of Google's products have been getting more AI features, including Chrome, which now offers split-screen Gemini chatbot support, the ability to automate web browsing, and more. Some desktop Chrome users have also noted that the browser appears to suddenly want more storage space for AI. This is true -- Chrome does download a 4GB AI model for on-device processing. It's been doing that for years, though. Google hasn't actually changed anything about Chrome's on-device AI, but the confusion is understandable, as the company has done a poor job of explaining what it's doing and why. This is, unfortunately, par for the course with Google's AI efforts. Just this week, someone noticed that Chrome had downloaded a 4GB Gemini Nano model and inferred from its sudden appearance that Google was deploying that AI on all Chrome installs right now. That's not exactly true. Google announced in 2024 that it would begin adding local AI capabilities to Chrome, powering features like Help Me Write, tab organization, and scam detection. The list of potential uses has changed over time, and Google never rolled the models out universally. It's possible your machine has been running a local Gemini Nano model since 2024, and it's also possible the AI was downloaded yesterday. Google tells Ars Technica the flags that determine whether or not Gemini Nano is installed on your machine are multifaceted and include (but are not limited to) your computer's hardware, account features, and whether you've visited a website that uses Google's on-device Gemini API. Because Gemini Nano is constantly appearing on machines for the first time, people may think this is something new. In reality, Google confirmed to Ars that Chrome's Gemini Nano model has been around 4GB in size since it debuted two years ago. The default problem So Google has not suddenly decided to gobble up 4GB of your storage space -- it did that two years ago, and nobody thought to get upset. But should you? A fresh Chrome install with no extensions eats up 6-8GB of storage, and it will grow considerably with cache and extension data. In a few months, Chrome can occupy 10 times more space than the AI model consumes. Maybe that's not ideal, either, but that's just the state of browsers today. Google says Chrome will delete the model if your machine runs low on storage, and you can turn off local AI features in the Chrome settings with a toggle under the System tab. Flip that off, and Chrome will remove the model and not redownload it. This is a fixable problem, but it shouldn't be a problem in the first place. Running AI models locally is generally a good thing -- that data stays on your machine rather than feeding a cloud-based model. It's a positive for privacy and security, and users should have that choice. But "choice" is the operative word, and Google isn't actually giving you one because AI is Google's new default. Maybe you don't want any of these AI features. If that's the case, Chrome should not consume 4GB of space for something you don't use without asking. We've seen numerous instances of Google opting everyone into new AI experiences. This is happening more and more as AI becomes the company's core focus, but Chrome's AI features show this is not a new phenomenon. Google should have asked if it could have 4GB of your hard drive for AI in 2024, and it should be asking in 2026. But Google knows defaults are powerful, which is why it has paid billions of dollars to be the default search engine on Apple devices. A curious omission Google users were more willing to excuse AI in 2024, but the backlash is real in 2026. People are increasingly looking to avoid AI features, which makes this 4GB stealth download all the more questionable. Google's obsession with AI has led to numerous stumbles, even when the company has ostensibly good intentions, because we are all (rightly!) hyper-focused on how this technology is impacting our lives. Some of those "good intentions" seem to have made the Chrome situation worse. As users sought ways to remove this AI model, many looked for the settings toggle. This happened to coincide with the wide release of Chrome 148, and the label for this toggle included a pretty suspicious change versus v147. Google removed the stipulation that its on-device AI model would not send data to Google's servers. This is alarming, as one of the primary benefits of local AI is its greater privacy. We reached out to Google to ask if this wording is due to a change in Chrome's on-device AI. "This doesn't reflect a change to how we handle on-device AI for Chrome," a Google spokesperson said. "The data that is passed to the model is processed solely on device." According to Google, the team decided to make this change earlier in 2026 to ensure it was being crystal clear about how AI works on the web. Chrome's local AI has an API that a site might use, for example, to do summarization or edit your writing. In these instances, the website would naturally see the input and output. If it's a Google website, that data ends up on Google's servers. If it's a non-Google site, Google doesn't see any of that data. That explanation may or may not be satisfying as the backlash against AI grows. Regardless, using the web is never completely private. If you're uncertain about using AI tools on a site, you should always try to parse its privacy policy, which will tell you how your data (AI-generated or not) will be used. As long as Google is deploying AI as an opt-out service, you'll have to be extra vigilant. As the saying goes, it's easier to ask for forgiveness than permission, but Google ought to be asking for permission a little more often.

You Can Disable Gemini in Chrome if It's Freaking You Out

If you use Google's Chrome browser for desktop, there's probably a Gemini Nano AI model running on your computer right now and taking up about 4 GB of space. That's not necessarily a bad thing, but if you didn't know about it and don't want it, there's a way to turn it off. The file started auto-downloading for Chrome users in 2024 after Google built Gemini Nano into the browser. But a report by That Privacy Guy this week and the ensuing reception it received highlighted how unaware many users were -- perhaps a result of a flood of AI services and features across the tech industry that have been difficult for users to keep up with. To uninstall the Gemini Nano file, open Chrome on your computer, in the top right corner click the "More" menu represented by three vertical dots, then go to Settings, System, and then toggle "On-device AI" to be off. The Privacy Guy article noted that if you directly uninstall the Gemini Nano file in the directory, Chrome will silently, automatically redownload it the next time the browser reboots. A Google spokesperson tells WIRED that the company started rolling out the On-device AI toggle in February so users can turn off the features if they choose and remove the model. "Once disabled, the model will no longer download or update," the spokesperson says in a statement. The company added, too, that the system is designed so Gemini Nano "will automatically uninstall if the device is low on resources." Google built the model into Chrome to enabled on-device AI scam-detection features. It was also aimed at providing a way for developers to integrate AI-related application programming interfaces while keeping data on users' devices when possible and out of the cloud. These features are separate from Chrome's AI Mode, which does not use the local Gemini Nano model. Parisa Tabriz, Chrome's general manager, emphasized in a post on X on Wednesday that integrating Gemini Nano "powers important security capabilities like on-device scam detection and developer APIs without sending your data to the cloud." Google certainly did announce the Gemini Nano integration into Chrome and discussed it publicly, but for users who simply use Chrome because it is the world's biggest, most recognizable browser and don't necessarily follow every granular update, the lack of an in-your-face notification about a large AI model file sitting and running on your computer may be upsetting. Longtime security and compliance consultant Davi Ottenheimer says that he follows Chrome updates closely but could have easily missed the Gemini Nano integration. "An on-device model could be a hidden minefield," he says. And the fact that Google launched the integration in 2024 but didn't start rolling out a settings control for users to turn it off until February shows that, at least initially, the feature wasn't conceived as something that users would interact with. Just because you can remove Gemini Nano from Chrome doesn't mean you necessarily should -- or that doing so is better for your privacy. Local processing is a more private way to utilize AI capabilities. If you remove the model, the features Google uses it for -- including the AI-enabled scam detection -- will cease to function. But since Gemini Nano is also used by Chrome to enable local AI processing for third-party developers, blocking this route could have a range of outcomes when interacting with non-Google web services in the browser. A Google spokesperson tells WIRED that if you turn off On-device AI, "certain security features will not be available, and sites that use the on device APIs will behave differently." Of course, if neither option seems right, there's always an alternative: Use a different browser.

Google Chrome Might Have Installed an AI Model Onto Your Device Without You Knowing

Alex Valdes from Bellevue, Washington has been pumping content into the Internet river for quite a while, including stints at MSNBC.com, MSN, Bing, MoneyTalksNews, Tipico and more. He admits to being somewhat fascinated by the Cambridge coffee webcam back in the Roaring '90s. You might not have asked for an AI model on your computer, but you might have gotten it anyway. Google Chrome has been installing a 4GB model onto devices without asking or notifying users. Google has been installing Gemini Nano -- an AI model that runs on devices like smartphones and laptops instead of in the cloud -- onto some people's Chrome browsers, without their permission, according to Alexander Hanff, a Swedish computer scientist and lawyer known as That Privacy Guy. And Google doesn't tell you that it's on your device after it's installed. Hanff said Gemini Nano will only be installed if the person's device meets the hardware requirements. It's unknown how many people have gotten the install. Gemini Nano performs tasks such as detecting scam phone calls, helping you write text messages, summarizing recordings and analyzing Pixel phone screenshots. It's not to be confused with the AI Mode pill in the address bar. If you use AI Mode, your queries are routed to Google Gemini servers -- not to Gemini Nano. A Google spokesperson told CNET that Gemini Nano will automatically uninstall if the device doesn't have enough resources, such as processing power, RAM memory, storage space or network bandwidth. "In February, we began rolling out the ability for users to easily turn off and remove the model directly in Chrome settings," the spokesperson said. "Once disabled, the model will no longer download or update." Google gives more information about on-device generative AI models in Chrome on this web page. If you're running Chrome, you might have Gemini Nano. Go to your file manager -- "File Explorer" for Windows, "Files" for Chromebooks, "Finder" for Macs -- and search for a folder called "OptGuideOnDeviceModel." In that folder, there will be a file called "weights.bin," and that is where Gemini Nano lives. Hanff said Chrome users will not know they have Gemini Nano unless they search for it, because "Chrome did not ask" and "Chrome does not surface it." If you want to get rid of Gemini Nano, there are a couple of ways. One is to uninstall Chrome entirely. The other way is to type "chrome://flags" into your browser address bar, then find "Enables optimization guide on device" and turn it off. Hanff said the push might be intended to help Google cut costs by moving AI work off its own servers and onto your computer. "Running inference on users' own hardware allows them to push 'AI features' without the compute costs," Hanff told CNET. But Hanff suggested there could be legal ramifications, at least in Europe. He suggested that the Gemini Nano install could constitute a breach of the European Union's General Data Protection Regulation's principles of lawfulness, fairness and transparency. Hanff said that, considering the potential environmental impacts, Google should have announced it under the Corporate Sustainability Reporting Directive. "Google has given us every reason not to trust them with a history spanning two decades of global privacy violations at massive scale," Hanff told CNET. "So, I suspect they figured asking permission (what the law requires) would hinder their ability to push this model and, of course, whatever comes after it."

Why Chrome may have quietly downloaded a 4GB file to your PC - and how to get rid of it

You'll see it if you've opted into the on-device AI setting in Chrome. Google is silently saving a Chrome-related file to many computers. That's nothing earth-shaking. But this file is a hefty 4GB in size, which has caught the attention of some Google watchers. What is the file, why is it being installed, and how can you check for it? Also: I let Chrome's AI agent shop, research, and email for me - here's how it went In a new blog post, computer scientist Alexander Hanff, aka the Privacy Guy, pulled back the curtain on this mysterious file. Named weights.bin, the file is being downloaded deep within the user data folder of many Chrome users. The file itself is related to Gemini Nano, which Google is using as the on-device AI model for Chrome users. Though there's nothing risky or dangerous about the file, Hanff and others have expressed concerns that it's being downloaded without users' knowledge or permission. And if you delete the file, it eventually comes back, Hanff said. That by itself is hardly alarming; that's part of any software update. Rather, some of the criticism centers on the file's size. If you have ample hard disk space, then 4GB is likely not a big deal. But if you're running low, that big a file might chew up space you can't spare. Traditionally, AI models like Gemini use the cloud to interact with you. Submit a request, ask a question, or kick off a conversation, and the AI taps into its online data and resources to respond. But that method can be slow and naturally requires that you be connected. By traveling between your device and the cloud, your data can also be exposed. A trend has emerged in which companies are experimenting with locally stored LLMs (large language models). That not only speeds up the process, but it also means you can use the AI offline and more securely. Gemini Nano has already been in play on Google's own Pixel phones. That explains why the file is so large; it has to pack in a lot of data. In this case, a weights file contains numbers that measure the level of importance an AI model assigns to your input. The AI uses these values to determine what should come next. For example, let's say you start typing the phrase "Why did my new phone cost me an arm and a..." at the prompt. The AI assigns weights to your input to help it predict that the next word would be "leg." Also: This powerful Gemini setting made my AI results way more personal and accurate How can you tell if the file has been downloaded to your PC? First, open Chrome, go to Settings, and select System. On the System screen, check whether the On-device AI option is turned on. If so, then you probably have the file or will soon get it. To double-check, you'll have to navigate to the user folder on your PC. That location varies based on your operating system. On my Windows 11 PC, I ran a search in File Explorer for weights.bin. The search took a long journey through the following path: C:\Users\lance\AppData\Local\Google\Chrome\User Data\OptGuideOnDeviceModel\2025.8.8.1141. At that final location, the weights.bin file appeared, measuring 4GB. Since the file is downloaded again if you simply delete it, you'll have to take an extra step to get rid of it permanently. After you delete the file, go back to Settings in Chrome and select System. Then turn off the switch for On-device AI. But as long as you have enough disk space (and if you can't spare 4GB, then it's time to clean up your drive), the file is little cause for concern. Just forget about it, especially if you're keen to try on-device AI, and we'll see what the future holds for Gemini Nano.

Chrome's AI features may be hogging 4GB of your computer storage

Google Chrome may be taking up more of your storage than expected thanks to a large on-device AI model file that, in some cases, is being automatically downloaded to the browser's system folders. Users who have noticed unexplained drops in their available desktop device storage are now discovering that Chrome is installing a 4GB weights.bin file inside their browser directory when certain AI features are enabled. The weights.bin file in question is connected to Google's Gemini Nano AI model, which powers Chrome AI tools like scam detection, writing assistance, autofill, and suggestion features. As the Gemini Nano model is designed to run locally, it needs to use training parameters stored on your device rather than pulling information from cloud-based models. That provides some privacy benefits, but isn't ideal if you're low on storage -- especially as users aren't being clearly notified about the file size requirements. If you have certain Gemini AI features enabled on Chrome, it's likely that the 4GB file has already been downloaded to your system. You can check by opening your Chrome data folders and inspecting the OptGuideOnDeviceModel directory for the weights.bin file. You can't simply delete this to free up space, however -- if you still have AI features enabled, Chrome may re-download it again in the future. That means you'll need to head to Settings>System and toggle off the On-Device AI option to remove those features and prevent the file from coming back. Google does specify that "Gemini Nano's exact size may vary as the browser updates the model," but this information is presented in a lengthy guide for built-in AI features rather than at the point of enabling them in Chrome. If Google had made the storage requirements clearer to users -- or provided an option to power Chrome AI features with cloud-based models -- this confusion could have been avoided. We have reached out to Google for comment.

Chrome Is Quietly Downloading a 4GB AI Model Without Your Permission

(Credit: Lily Yeh; Andriy Onufriyenko / Moment via Getty Images; Google) Google Chrome offers plenty of AI features, but some of them could quietly eat up your device storage. As spotted by The Privacy Guy, the browser automatically downloads a 4GB model to support on-device AI features, and it may stay on your PC unless the features are turned off. The AI model in question is Gemini Nano, a lighter version of Google's Gemini model that runs on your computer to support features such as writing assistance, web page summaries, scam detection, and tab organization. If you opt in to these features, Chrome will download a file named "weights.bin" in the OptGuideOnDeviceModel folder without notifying you. According to The Privacy Guy, the file gets downloaded when you run Chrome 147. I wasn't able to find the file on my Mac running the same version, but 9to5Google spotted it on a Windows machine. You can delete the file manually, but it will resurface if you leave on-device AI features enabled in Chrome. To disable them and free up some internal storage, go to Chrome Settings, select System from the left pane, and turn off On-device AI. Google first announced Gemini Nano for Chrome in 2024, but added an option to disable the on-device features it supports just a few months ago. In a statement to 9to5Google, the company noted that Chrome may delete the "weights.bin" file automatically if it detects low storage on your machine. "While this requires some local space on the desktop to run, the model will automatically uninstall if the device is low on resources," Google said. "In February, we began rolling out the ability for users to easily turn off and remove the model directly in Chrome settings. Once disabled the model will no longer download or update."

Google Chrome 'silently' downloads 4GB AI model to your device without permission, report claims -- researcher says practice may violate EU law, waste thousands of kilowatts of energy

Security researcher Alexander Hanff, also known as "That Privacy Guy," has published a new analysis claiming that Google Chrome is silently downloading a roughly 4GB on-device AI model to users' machines without notice or consent. According to Hanff, the behavior mirrors a separate issue he recently identified involving Anthropic's desktop software, and together the two cases point to a broader pattern of how large tech companies deploy AI features. Hanff's earlier report focused on Anthropic's Claude Desktop app, which he says quietly installed a browser integration bridge across multiple Chromium-based browsers on a system, including five browsers he did not even have installed. According to the researcher, this happened without any user prompt or meaningful disclosure, and the integration would reinstall itself if removed. He argues that this kind of silent modification of a user's environment violates both user expectations and, in his view, European privacy law. That earlier finding serves as context for what Hanff describes as a similar but even larger-scale issue with Chrome. In his latest post, he says Chrome is now writing a file called "weights.bin" to disk, part of the company's on-device AI system based on its lightweight Gemini Nano model. The file is approximately 4GB in size and is downloaded automatically on systems that meet certain hardware requirements. According to Hanff, there is no clear consent flow for this download. He says Chrome does not present a prompt explaining that a multi-gigabyte AI model will be stored locally, nor does it provide a straightforward setting to prevent it. Users who discover and delete the file will find it re-downloaded later unless they disable certain experimental flags or remove Chrome entirely. To verify what was happening, Hanff conducted a controlled test using a fresh Chrome profile on macOS. He relied on the operating system's filesystem event logs, which record file activity independently of applications. According to his analysis, the browser created the model directory and downloaded the full 4GB payload in the background while no human interaction was taking place. The process completed in just over fourteen minutes, during what appeared to be idle browsing time. He also points to Chrome's own internal state files as corroborating evidence. These show that the browser evaluated the system's hardware capabilities and marked it as eligible for the on-device model before the download occurred. In Hanff's telling, this indicates that Chrome is proactively deciding which users' machines should receive the model, rather than responding to an explicit user action. Beyond the technical details, Hanff raises legal concerns. He argues that both the Anthropic case and the Chrome case likely violate provisions of EU law, including the ePrivacy Directive's rules on storing data on user devices and the GDPR's requirements around transparency and lawful processing. These claims have not been tested in court, but they reflect a growing tension between aggressive feature rollout and regulatory expectations, particularly in Europe. (Data above calculated by Alexander Hanff) A key focus of Hanff's post is the environmental cost of silently distributing a 4GB AI model, where he highlights the perils of distributing a file of this size on a global scale. If deployed across hundreds of millions or billions of devices, Hanff estimates the total emissions impact of simply distributing the file (not even using it) could reach tens of thousands of tons of CO2 equivalent, an amount similar to the annual output of tens of thousands of cars. That estimate depends heavily on possibly dubious assumptions about scale and energy mix, but his broader point, that pushing large binaries to user devices is not free and the cost is externalized, is completely valid regardless of the math. For many users, the more immediate concern is bandwidth. A 4GB download is trivial on an unlimited fiber connection, but that is very much not the global norm, nor is it common even in the United States. For users whose data is capped, metered, or expensive, including most of the developing world, silently transferring gigabytes of data can have real financial consequences. Even in developed markets, users on mobile hotspots or rural connections may feel the impact acutely. Hanff argues that downloading files of this size without clear notice or consent crosses a very clearly demarcated line, regardless of the feature being delivered. Taken together, the two cases reinforce a familiar criticism of large technology platforms. According to Hanff, both Anthropic and Google acted first and left users to discover the consequences later. Whether it is silently registering deep system integrations (in the case of Claude Desktop) or downloading multi-gigabyte AI models in the background, the pattern is the same: the user's device is being treated as a deployment target rather than something the user actively controls. That framing may sound harsh, but it aligns with long-standing complaints about "dark patterns" in software design. Features that benefit the platform at the user's cost are enabled by default, buried behind obscure settings, or implemented in ways that make them difficult to remove. Hanff's reporting suggests that the shift toward on-device AI is not changing that dynamic, and in fact may be accelerating it. Google has not publicly responded in detail to Hanff's findings at the time of writing, and the company may argue that these downloads are tied to legitimate product features and improve privacy by keeping AI processing local. Even so, the core question remains unresolved. If a browser is going to download gigabytes of data onto a user's machine, should that require an explicit opt-in? Hanff's answer is clearly yes. Whether regulators or users ultimately agree may determine how far companies can push this kind of behavior in the future. Follow Tom's Hardware on Google News, or add us as a preferred source, to get our latest news, analysis, & reviews in your feeds.

Chrome silently installs a 4 GB local LLM on your computer

Google Chrome will steal 4 GB of disk space from your computer for its local large language model unless you opted out. It's called weights.bin and it's stored in a folder called OptGuideOnDeviceModel. What's more, if you track down the file and delete it, Chrome will download a fresh copy and reinstate it. The discovery was announced this week by Alexander Hanff, who blogs as "the Privacy Guy," in a somewhat sensationally titled blog post: Google Chrome silently installs a 4 GB AI model on your device without consent. At a billion-device scale the climate costs are insane. It doesn't seem to be new, though: there are signs that Chrome has been doing this for quite some time. In April 2025, this Reddit post suggests the model was "just" 3 GB, but a Stack Overflow question says that by November 2025 it was already up to 4 GB. We would not be at all surprised if soon it went to five. This the what Google calls the "Nano" version of its Gemini local LLM, which powers its Prompt API. That page links to general info about Google's Gemini LLM, but the site about its use on Android has some specific info about Gemini Nano. The Reg FOSS desk is an unapologetic AI skeptic and disabled every option they could find pertaining to AI usage in Chrome as early as possible, and as far as we can see, we did not have the local model installed on any of our computers. For instance, on our increasingly geriatric iMac, we checked with this macOS terminal command: find ~/Library/Application\ Support/Google/Chrome -size +1G -ls 2>/dev/null We also searched the entire C: drive of a ThinkPad reinstalled with Windows 10 IoT LTSC last year and there was no weights.bin anywhere. If you didn't opt out, Google has some info on how to disable it. In brief: in Chrome's address box, enter the special URL chrome://flags. In the resulting page, look for an entry named optimization-guide-on-device-model and set it to Disabled, then restart Chrome. The browser should then delete the weights.bin file. In theory, you can also use your OS to block this - or deploy enterprise policies, if you're free to set your own. (With any luck, soon this will be part of the Just The Browser policy that we reported on in January.) The Reddit post we linked above says that Windows users can set a Registry key. Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome, create a DWORD key called GenAILocalFoundationalModelSettings and set it to 1, then restart Chrome. We've not tried this ourselves - our barely used Windows install doesn't have a Google tree in there at all. The late great Grace Hopper used to hand out 30 cm (roughly 1 foot) lengths of wire as physical examples of a nanosecond: that's how far light can travel in one billionth of a second. If Google considers a 4 GB model to be "nano" sized, then it puts Hanff's hyperbolic comment about the climate footprint into real perspective. It gives a hint of the size of the real gigantic models in the datacenters metastasizing across the world. A recent study led by Grace Liu at Carnegie-Mellon found that regular AI use caused measurable cognitive impairment. It's worth thinking carefully about what we trade away when we outsource our thinking and, separately, what the planet pays to power the systems we're outsourcing it to.

Chrome is quietly downloading a 4GB AI file without telling you, says researcher

Like every tech giant, Google is going all-in with all things AI. In fact, the company is pushing into the space so hard that it looks like Chrome is downloading a 4GB file containing details for running Gemini Nano, Google's on-device LLM, according to computer scientist Aleander Hanff, who published the details earlier this week on his website. Based on Hanff's very in-depth analysis (make sure you give it a look), a file named "weights.bin" in the Chrome folder in macOS' Library directory (which is normally hidden), measures in at 4GB. According to Hanff, there's no prompt asking users to download the Gemini Nano file, which powers Chrome features like Help Me Write and on-device scam detection. Google sent the following statement to several publications regarding the 4GB file: "We've offered Gemini Nano for Chrome since 2024 as a lightweight, on-device model. It powers important security capabilities like scam detection and developer APIs without sending your data to the cloud. While this requires some local space on the desktop to run, the model will automatically uninstall if the device is low on resources. In February, we began rolling out the ability for users to easily turn off and remove the model directly in Chrome settings. Once disabled the model will no longer download or update. More details in our help center article." Windows 11 PCs are also affected Hanff claims that installing this file without user consent violated European privacy laws I haven't updated Chrome in quite some time (I'm primarily a Firefox user), so I don't have the file on my Mac. Based on reports, the file appears after updating to Chrome version 148.0.7778.97. Hanff notes that he's also experienced similar behavior across several Windows Chrome installations: The user deletes, Chrome re-downloads, the user deletes again, Chrome re-downloads again. The only ways to make the deletion stick are to disable Chrome's AI features through chrome://flags or enterprise policy tooling that home users do not generally have, or to uninstall Chrome entirely. To get rid of the file, you need to do is navigate to Chrome's Settings > System on the left menu, and toggle off AI features. In his blog post, Hanff outlines how he believes Google adding this file to users' devices without their permission violates several European privacy laws, including the GDPR. Hanff also delves into the environmental cost, estimating that a "mid-band" deployment of this 4GB file would likely hit 500 million devices, or 15 percent of Chrome users, pushing 30,000 tonnes of CO2e (the annual emissions of roughly 6,500 cars).

Google Chrome Is Silently Downloading a 4GB Gemini Nano AI Model to User Devices - General Chat

Google Chrome has been quietly downloading around 4GB of Gemini Nano AI model weights to user devices without their consent, and it automatically re-downloads the files if they are deleted. This behavior has been confirmed on Windows 11, Apple Silicon, and Ubuntu systems, with user reports indicating it has been happening for about a year. The files are stored in a folder named OptGuideOnDeviceModel. On Windows 11, the path is %LOCALAPPDATA%\Google\Chrome\User Data\OptGuideOnDeviceModel. What Chrome's 4GB Gemini Nano Download Is Used For The 4GB folder isn't used for Chrome's main AI features. The AI Mode that appears in the address bar and in Google Search runs on Google's servers, not from the locally stored weights. The downloaded model is only used for writing assistance and a few other features that are accessible through several menus in the browser. Users who haven't enabled or looked for those features might have the model stored on their device without realizing it serves any function they use. How to Check for and Remove Chrome's AI Model Deleting the OptGuideOnDeviceModel folder doesn't stop Chrome from redownloading it. The most reliable way to remove it is to uninstall Chrome completely. If you want to disable the download without removing Chrome, you can try the following: Type chrome://flags into the address bar. Search for "Enables optimization guide on device on Android." Set the dropdown to Disabled. This flag also shows whether a device is eligible for the feature. Older hardware might not qualify, and the download seems to be limited to newer machines.

Chrome May Quietly Use 4GB for AI Features: Here's How You Can Stop It

(Credit: Lily Yeh; Andriy Onufriyenko / Moment via Getty Images; Google) Google Chrome offers plenty of AI features, but some of them could quietly eat up your device storage. As spotted by The Privacy Guy, the browser automatically downloads a 4GB model to support on-device AI features, and the large file may stay on your computer unless the features are turned off. The AI model in question is Gemini Nano, a lighter version of Google's Gemini model that runs on your computer to support features such as writing assistance, web page summaries, scam detection, and tab organization. If you opt in for these features, Chrome will download a file named "weights.bin" in the OptGuideOnDeviceModel folder without notifying you. According to The Privacy Guy, the file gets downloaded when you run Chrome 147. I wasn't able to find the file on my Mac running the same version, but 9to5Google spotted it on a Windows machine. You can delete the file manually, but it will resurface if you leave on-device AI features enabled in Chrome. To disable them and free up some internal storage, go to Chrome Settings, select System from the left pane, and turn off On-device AI. Google first announced Gemini Nano for Chrome in 2024, but added an option to disable the on-device features it supports just a few months ago. In a statement to 9to5Google, the company noted that Chrome may delete the "weights.bin" file automatically if it detects low storage on your machine. "While this requires some local space on the desktop to run, the model will automatically uninstall if the device is low on resources," Google said. "In February, we began rolling out the ability for users to easily turn off and remove the model directly in Chrome settings. Once disabled the model will no longer download or update."

Chrome downloads a 4GB AI file without user consent, researcher alleges - Engadget

If you've paid any attention to Google lately, you know that it wants us using its AI tools. So much so that Chrome apparently downloads a 4GB file containing details for running Gemini Nano, Google's on-device LLM. Computer scientist Alexander Hanff published the details earlier this week on his website The Privacy Guy and goes into extreme detail on why this isn't a good look for Google. I just verified what he said about the file, named "weights.bin" and found itin the Chrome folder in the macOS Library directory (which is ordinarily hidden so that users don't mess with potentially critical files). Indeed, its a 4+ GB file right where he said it would be. Hanff correctly notes that at no point does Chrome prompt users to ask if they'd like to install the Gemini Nano weights, which Chrome users for AI-powered features like "help me write" and on-device scam detection. It's worth noting that on a second Mac I checked, the weights.bin file was not installed, nor was it found on a coworker's laptop. Shortly after updating Chrome to version 148.0.7778.97 on my personal laptop, the directory and file appeared. And when I deleted the directory containing the file on the first computer I checked, the large weights.bin file returned several minutes later. Hanff wrote that he saw similar behavior across multiple Windows installations, as well. "The user deletes, Chrome re-downloads, the user deletes again, Chrome re-downloads again. The only ways to make the deletion stick are to disable Chrome's AI features through chrome://flags or enterprise policy tooling that home users do not generally have, or to uninstall Chrome entirely." As Hanff notes, there are numerous issues with this behavior. It's an invisible download that the user isn't privy to and there's no opt-in, nor is it easy to remove. It's also deeply hidden in directories most users don't check, with a generic name that doesn't give any real information on what it is for. Additional issues that Hanff calls out includes that this may violate European privacy laws, including GDPR. There's also the potentially large environmental cost. Hanff estimates that a "mid-band" deployment of this 4GB file would hit 500 million devices, or about 15 percent of Chrome users. That push would result in rough 30,000 tonnes of CO2e -- the annual emissions of 6,500 cars. He also notes that this is only the initial delivery cost and that plenty of additional factors would make for a higher energy cost. We reached out to Google for comment but did not receive a response before publication. We'll update this story if we hear back.

Google Chrome has been silently pushing a 4GB AI model to your device without asking

Serving tech enthusiasts for over 25 years. TechSpot means tech analysis and advice you can trust. Ripple effect: Google started turning Chrome, the world's most popular web browser, into an AI browser last year in response to threats from popular AI-native rivals such as OpenAI. Recent reports have uncovered that this transition includes silently installing a large cache of AI weights on an unknown but potentially significant number of devices. Google Chrome users who have noticed unusual disk activity or unexplained drops in available storage should look for a folder called "OptGuideOnDeviceModel" inside their Chrome directory. It holds roughly 4GB of weights for Google's Gemini Nano LLM, downloaded by the browser without user consent. Deleting the folder offers no lasting relief - Chrome will simply redownload it. On Windows 11, the folder resides at %LOCALAPPDATA%\Google\Chrome\User Data\OptGuideOnDeviceModel. It has also been confirmed on Apple Silicon and Ubuntu machines. Uninstalling Chrome entirely is the most effective way to remove the weights. However, those who wish to continue using the browser might be able to disable the download by entering "chrome://flags" into the address bar, finding an item called "Enables optimization guide on device on Android," and selecting "Disabled" from the adjacent dropdown menu. This is also how users can determine whether their device is eligible for the feature. According to Alexander Hanff, a computer scientist and lawyer who verified the behavior in the macOS kernel file system log, users have reported the automatic downloads for around a year. They might coincide with the introduction of AI features in Chrome last fall, such as writing assistance, AI summaries, and automatic browsing. The downloads carry a notable irony: Chrome's most visible AI feature, the AI mode integrated into the address bar and Google Search, runs on Google's servers rather than the locally stored weights. The 4GB folder is only used for writing assistance and a handful of other features accessible several menus deep. Given Chrome's billions of users, the total number of affected devices - and the bandwidth consumed - could be substantial. Hanff estimates that pushing 4GB to hundreds of millions or billions of devices would amount to several exabytes of data transferred, potentially generating between 6,000 and 60,000 metric tons of CO2. However, determining the total number is difficult. This editor searched for the AI weights on two Windows 11 devices that are a few years old and found that both were ineligible, so Google might only be pushing the LLM to more modern machines. Hanff has formally accused Google of violating European privacy regulations by compelling users to download a significant volume of data without their knowledge or consent.

Google weighs in on Chrome's weights.bin controversy

Earlier today, we wrote about Chrome automatically downloading a large, poorly explained file called weights.bin to desktop computers. Gossip is floating around online that the file is some type of virus or spyware, but it's actually the Gemini Nano model used for on-device AI features in Chrome -- still annoying, maybe, but not nefarious. Now, Google's provided Android Authority with a statement about the file. "We've offered Gemini Nano for Chrome since 2024 as a lightweight, on-device model. It powers important security capabilities like scam detection and developer APIs without sending your data to the cloud," a Google spokesperson told Android Authority in an email. "While this requires some local space on the desktop to run, the model will automatically uninstall if the device is low on resources. In February, we began rolling out the ability for users to easily turn off and remove the model directly in Chrome settings. Once disabled the model will no longer download or update."

Google Chrome Is Downloading a 4GB AI Model Onto Your Device Without Consent, Researcher Warns

Even if you aren't using Google Gemini, it might be using your device. Security researcher Alexander Hanff, also known as "That Privacy Guy," recently reported that Google's widely used Chrome web browser is quietly storing an on-device AI model without explicitly asking for user permission. According to Hanff, Chrome secretly stashes about 4GB of AI model files on Chrome users' devices (though it should be noted that many users have been unable to find the file). The reported model is stored in a folder called OptGuideOnDeviceModel. The largest part of that folder is a file called weights.bin. Hanff claims that the weights are for Gemini Nano, Google's lighter-weight, on-device version of its large language model. Per the researcher's findings, the Nano model is installed on any device that meets the minimum hardware requirements to host it. Google Chrome reportedly does not offer any prompt for the user to affirmatively agree to install the model, nor is there any setting to opt out or remove the files. If you track down the files yourself by parsing through Chrome's install library, you can manually delete the modelâ€"but Hanff reported that it will automatically be redownloaded the next time you restart Chrome, without any indication that it's happening. Hanff claims to have independently demonstrated this happening on both Windows and MacOS devices. Gizmodo asked Google for clarification about the file. A spokesperson for the company explained, "We’ve offered Gemini Nano for Chrome since 2024 as a lightweight, on-device model. It powers important security capabilities like scam detection and developer APIs without sending your data to the cloud. While this requires some local space on the desktop to run, the model will automatically uninstall if the device is low on resources. In February, we began rolling out the ability for users to easily turn off and remove the model directly in Chrome settings. Once disabled, the model will no longer download or update." While Hanff has drawn more attention to the 4GB of unwanted AI weights, he's certainly not the first to notice it. A number of people have called attention to the file over the last year or so across IT forums and online communities, most wondering what it is and asking how to get rid of it. By all accounts, it does appear that the file is, in fact, an on-device version of Gemini Nano. And while Google certainly doesn't appear to ask for permission to install its AI model on your device, it also doesn't exactly hide that it's happeningâ€"as long as you know where to look. According to Google's own documentation, the on-device AI model is what is used for most AI-related tasks. There's even an API that developers can access to use the on-device Nano model for AI-powered features. The closest you'll find to Google explaining this to the user is in Chrome's terms of service. Within that text, Google states: "We’re constantly developing new technologies and features to improve our services. For example, we use artificial intelligence and machine learning to provide you with simultaneous translations, and to better detect and block spam and malware. As part of this continual improvement, we sometimes add or remove features and functionalities, increase or decrease limits to our services, and start offering new services or stop offering old ones. When a service requires or includes downloadable or preloaded software, that software sometimes updates automatically on your device once a new version or feature is available." So, what exactly can you do about the on-device AI model that Google is storing for you? First, check to see if it is actually on your device. You can do this by visiting "chrome://on-device-internals" via the Chrome omnibar, where you'd enter a URL or search term. This will tell you the model is on your device and how much space it takes up. From there, removal will depend on what is available in your browser. If you are one of the users who have had the opt-out mentioned by the Google spokesperson rolled out to your browser, you can simply open Chrome, go to the Settings menu, select System, and choose "Turn On-device AI on or off." If you don't have that option, there are some workarounds others have found. According to Hanff, you can enter "chrome://flags" in the Chrome omnibar and disable AI-related features to prevent it from automatically re-downloading the model once it is removed. Others have recommended changing the "weights.bin" file to read-only to prevent Google from re-installing it. It should be noted that some users have reported that deleting the AI model from Chrome can make the browser act a bit funkyâ€"and you definitely shouldn't expect any of the AI-related features to function once you remove it.

Chrome AI takes up 4GB of your computer storage and there may be nothing you can do about it

AI features have made their way into nearly everything, whether you want them or not. And they tend to take up tons of space. Now we know that Chrome comes with 4GB of AI onboard that it deposits into your storage In a post on That Privacy Guy, Alexander Hanff writes that Chrome comes with a 4GB weights.bin file for Gemini Nano that it writes to disk. There is no warning about the massive size or option to deselect AI features during the download of Chrome. According to Hanff, the file powers the "Help me write" feature, on-device scam detection, and other AI-assisted browser functions. Don't be fooled about privacy Hanff cautions that this seemingly local version of AI does not come with the privacy that would be implied. "Every query the user types into it is sent over the network to Google's servers for processing by Google's hosted models," he writes. In other words, users are not getting any benefit in exchange for those precious 4GB. Deleting doesn't always work If you're low on space on your computer and are ready to remove the file, there's some bad news. While you can find the file by opening the OptGuideOnDeviceModel directory in Chrome data folders, it's very likely that after you delete it, Chrome will reinstall it. If you successfully delete it, you can try to prevent a reload by going to Settings>System and toggling off the On-Device AI option, but that doesn't work for everyone. I was able to do it on a MacBook running Chrome version 148. But I was not able to do it on a Pixelbook Go running Chrome version 147. Subscribe for deeper coverage of AI storage and privacy Crave clearer analysis? Subscribe to the newsletter for expert coverage of on-device AI storage and privacy trade-offs, explaining what embedded AI means for your device space and data so you can decide wisely. Get Updates By subscribing, you agree to receive newsletter and marketing emails, and accept our Terms of Use and Privacy Policy. You can unsubscribe anytime. If you're looking for the bright side, you will not lose your last bit of space to Gemini Nano. On a Google page for developers, Google says, "The Gemini Nano model is automatically deleted if the device's free disk space drops below a certain threshold." Related Google just gave Chrome a massive AI overhaul Gemini's familiar side panel is in Chrome now Posts By Karandeep Singh Oberoi

Google Chrome takes up 4GB of storage on your computer for AI, if you have space

The ongoing march of AI features continues to go on, whether you want it to or not, and a recent update to Google Chrome probably installed a few gigabytes of local AI models on your computer. As highlighted in a post from The Privacy Guy and since talked about widely across the web, Google Chrome now "silently" installs 4GB worth of AI models - Gemini Nano - on your machine without directly telling you about it. The change happened recently, and eats up that additional storage on your computer with no warning. Google performs the change in the background, though it seems to depend on whether or not you have certain Gemini in Chrome features enabled. This includes "Help me write" as well as background AI-powered features such as on-device scam detection. Google launched the latter in May of 2025, so this local storage probably isn't a particularly new change. Google first announced Gemini Nano would be coming to Chrome in 2024. The 4GB of storage can be found in the "OptGuideOnDeviceModel" in a "weights.bin" file. On a developer page, Google explains that Chrome downloads a Gemini Nano model based on the "user's hardware," with Gemini Nano updates handled automatically in the background. Importantly, Google says that Gemini Nano is the first thing to go if Chrome detects that a user is running low on storage: Chrome actively manages disk space to ensure the user doesn't run out. The Gemini Nano model is automatically deleted if the device's free disk space drops below a certain threshold. The Verge notes that you should can delete the file manually, but Chrome will re-download it unless you toggle off an "on-device AI" setting in Settings > System. We couldn't access that setting, though, on a MacBook running Chrome v147. Ironically, Google's documentation on AI in Chrome tells developers that "it's best practice to alert the user to the time required to perform these downloads." Google has not directly commented on the recent criticism over Chrome's storage use for local AI.

Chrome silently downloads a 4GB AI model. Here's how to remove it

Users can permanently remove the file by disabling "On-device AI" in Chrome's system settings. Detailed instructions are provided below. Google's Chrome browser is already a notorious storage hog, but now comes word that it's crowding our PC drives in a new way: with a local AI model. That model, spotted by That Privacy Guy, gets silently downloaded to your PC or Mac upon installing Chrome, and it gobbles up a whopping 4GB of storage space. Spoiler alert: Yes, you can remove the file, and I'm going to show you how. But first, some details on what's going on. The specific file is called weights.bin. On my Mac, I found it in Chrome's Applications Support folder in Finder: ~/Library/Application Support/Google/Chrome/OptGuideOnDevice Model/ Windows users will find the file in the AppData directory: C:\Users\<YourUsername>\AppData\Local\Google\Chrome\User Data\OptGuideOnDeviceModel\ To get to the AppData directory, press Windows Key + R, type directly into the dialog box, then press Enter. On my Mac, the weights.bin file was taking up 4.27 GB of storage. If you delete the file, Chrome will simply reinstall it the next chance it gets. So, what exactly is weights.bin and what does it do? As That Privacy Guy notes, that file includes the "weights" for Gemini Nano, the local AI model that lives in Google's Chrome browser. Unlike Gemini in the cloud, Nano sits directly on your PC and performs a variety of AI tasks directly on your system. Among the local AI duties that Gemini Nano may handle include summarizing web pages you visit, organizing your Chrome tabs, warning you about online scams, and offering writing help or rephrasing text as you type, according to a Google support page. Having a local AI model on your machine offers a number of advantages depending on the task, including lower latency and potentially greater privacy (although Chrome may still be sharing at least some of your browser activity with Google HQ). But local models also take up a lot of storage space. Gemini Nano's 4GB footprint actually isn't bad as far as smaller local models go -- the 31 billion-parameter version of Google's Gemma 4 takes up 20 GB of storage, for example, while the 128 billion-parameter Mistral Medium hogs a massive 80 GB of space. Again, simply deleting the weights.bin file won't work, as Chrome will automatically reinstall the missing file. But you can remove the 4GB download another way: by changing a single Chrome setting. Just go to Settings > System, then toggle the "On-device AI" setting to Off. When I did that on my Mac, the weights.bin file disappeared immediately. Of course, turning Chrome's local AI setting off nixed Chrome's local AI functionality, including text suggestions and scam warnings. As far as Chrome quietly installing the local AI model on your system in the first place, it's a matter of hot debate. For his part, The Privacy Guy calls out Google for depositing the file on users' PCs without a consent dialog -- and he has a point. Moving ahead, though, we're going to see more and more desktop apps downloading local AI models onto our systems, for better or worse.

Stop Chrome Browser From Downloading a Hidden 4GB AI File

If your Mac's storage has been mysteriously shrinking recently and you use Google Chrome, you may have already identified the culprit. The browser has been downloading a 4GB AI model file onto computers without explicit user consent. Here's how to reclaim the space. The file in question is called "weights.bin," which powers Google's on-device Gemini Nano AI model - the engine behind Chrome features like scam detection, autofill suggestions, and the "Help Me Write" tool. Local models tend to be pretty big storage-wise, and this one is no different. The problem is that Google hasn't clearly signposted the fact that it's eating 4GB of your drive with training data. The issue only recently came to light thanks to security researcher Alexander Hanff, who noticed that Chrome installs the model on any device meeting the minimum hardware requirements, only without prompting you whether you'd like it there in the first place. The first thing to do is confirm that the model is actually taking up space on your machine. While there's no clear answer in Google's release notes, recent reports suggest that the file started appearing after updating to Chrome version 148.0.7778.97. Here's how you can find out if your computer was affected: If the folder exists and contains a file called weights.bin, the model is installed. You can right-click the file and choose Get Info to confirm its size. If the folder isn't there, you can relax - Chrome hasn't downloaded the model to your Mac. Simply deleting weights.bin from Chrome's library folder isn't a long-term solution because Chrome will likely quietly re-download it the next time you launch the browser. To make the removal permanent, you need to disable Chrome's on-device AI features. Once this setting is switched off, Chrome will remove the model and should stop downloading it in future updates. Remember that deleting the model will also disable any Chrome features that rely on it. If you don't see the toggle in Chrome's Settings, it likely hasn't propagated to your computer yet. In that case, type chrome://flags into Chrome's address bar and disable any AI-related flags you see, then delete the weights.bin file manually in Finder. If after that you're still concerned about the lack of consent, it might be worth switching to a different browser.

Chrome may be downloading a 4GB AI model -- here's what we know

Is Chrome stealing your storage? The 'weights.bin' controversy explained I didn't expect Google Chrome to take up this much space on my computer. According to a recent report from Cybernews, some users have discovered a large file (around 4GB) quietly sitting inside Chrome's system folders. The file is reportedly named weights.bin, and it may be tied to a new wave of AI features rolling out inside Google's browser. So, the obvious question is why is Chrome downloading something this big -- and did you agree to it? Here's what's actually going on. What is the 4GB file in Chrome? At the heart of the controversy is a file called weights.bin, which researchers say is part of an on-device AI model used by Google Chrome. Specifically, it appears linked to Gemini Nano, Google's lightweight AI model designed to run locally on your device instead of in the cloud. This model powers features like writing assistance, text summarization, scam and phishing detection as well as AI-powered autofill and suggestions. So, instead of sending your data to a server, the model runs directly on your computer, which is technically better for privacy. Of course, there's an obvious tradeoff (storage). Why is the AI model so big? The thing is, even "lightweight" versions like Gemini Nano can take up gigabytes of storage because they include massive sets of trained parameters, hence a file like weights.bin. This explains why some users are noticing a sudden 4GB increase in storage usage, new folders inside Chrome directories (like OptGuideOnDeviceModel) and no obvious notification explaining what was downloaded. But all of that could be a big problem for anyone using a laptop with limited space. Did Chrome install this file without permission? Well, this is where things get a bit...murky. According to the Cybernews report, the model may download automatically when certain AI features are enabled, but users aren't always clearly told that a multi-gigabyte file is part of that process. There's no strong evidence that Chrome is installing this on every device without consent. But there is a growing concern that the download isn't always clearly explained or that it may be tied to features users didn't realize were enabled. In other words, there's no obvious "yes/no" moment for the storage impact. The company just wasn't exactly transparent. How to check if it's on your PC If you're curious (or low on storage), here's how to look: * Open File Explorer (Windows) or Finder (Mac) * Navigate to your Chrome data folders * Look for directories with names like: OptGuideOnDeviceModel or files named weights.bin These locations can vary depending on your system, but they're typically buried in Chrome's application data folders. Can you delete it? Yes, you can delete it, but there's a catch. If you delete the file, Chrome may re-download it later if the related AI features are still active. You may notice that some AI-powered features inside the browser may stop working. To fully prevent it from coming back, you may need to disable certain AI features in Chrome settings or, turn off experimental flags tied to on-device AI. Keep in mind that these settings aren't always easy to find yet, which is part of the issue. Why this is happening now While this may feel like a bug, it's actually a shift. Big tech companies like Google are rapidly moving toward on-device AI, where your laptop or phone does the processing instead of the cloud. This shift comes with benefits like better privacy, faster responses and offline functionality. But it also means your devices are starting to store parts of the AI themselves. And that's new (and a storage shock) for many users. Bottom line This isn't a "Chrome is secretly installing something malicious" situation, but it does show where software is heading. As AI gets baked into everyday tools, your computer is quietly becoming part of the system that runs it. The real issue isn't the 4GB file, it's whether anyone told you it would be there. Right now, that transparency feels like a work in progress, which makes it worth paying closer attention to what's being stored on your device. Follow Tom's Guide on Google News and add us as a preferred source to get our up-to-date news, analysis, and reviews in your feeds. Subscribe to Tom's Guide on YouTube and follow us on TikTok.

Google quietly installed a giant 4GB AI update through Chrome

Hidden Gemini Nano download is triggering backlash over bandwidth costs * Google Chrome silently downloaded a massive AI model onto devices without user consent * Users deleting Gemini Nano files watched Chrome reinstall everything automatically afterward * Regulators are now facing questions about consent laws and silent AI deployments Google Chrome has been quietly downloading a 4GB AI model called Gemini Nano onto user devices without asking for permission first. The file, named weights.bin, lives deep inside Chrome's user profile directory and powers on-device AI features like "Help me write" and scam detection. Users cannot find any checkbox in Chrome Settings labelled "download a 4GB AI model" because no such option exists at all. Silent download is causing outrage among users The environmental cost of pushing 4GB to hundreds of millions of devices is staggering by any reasonable measure. At Chrome's global scale, the climate bill for one model push lands somewhere between 6,000 and 60,000 tonnes of CO2 equivalent emissions - roughly the annual output of a small wind farm or the emissions from thousands of passenger cars every single year. Mobile data plans in many parts of the world treat 4GB as a month's entire allowance, yet Chrome consumes that in one unrequested download. When users try to opt out of the AI tools by deleting the weights.bin file, Chrome treats the action as a transient error to be corrected on the next eligible window and re-downloads the entire 4GB package again. The only ways to make the deletion permanent require disabling AI features through chrome://flags or enterprise policy tools that home users do not typically possess. A freshly created Chrome profile that received zero keyboard or mouse input from any human still contained the full 4GB model within 15 minutes of being created. The browser downloaded the file while sitting idle, waiting for a five-minute timer to expire on a third-party website. What makes this legally and ethically problematic The ePrivacy Directive explicitly prohibits storing information on a user's device without prior, informed, and unambiguous consent. Chrome functions perfectly well without a 4GB on-device LLM, so no "strictly necessary" exemption applies to this situation. The GDPR requires transparency and fairness in processing personal data, but users were never told about the download at all. The most visible AI feature in Chrome's omnibox, labelled "AI Mode", does not even use the on-device model, as those queries go straight to Google's servers instead of being processed locally on the user's own device. This makes the 4GB install a pure cost imposed on users with no offsetting privacy benefit at all. The company has not published any analysis of the welfare impact on populations whose internet access is metered and limited. Also, regulators are yet to answer whether global tech corporations are exempt from statutes that have been on the books since 2002. Via The Privacy Guy Follow TechRadar on Google News and add us as a preferred source to get our expert news, reviews, and opinion in your feeds.

Fury Erupts After Google Chrome Sneakily Installs 4 GB AI Model On Users' PCs

Can't-miss innovations from the bleeding edge of science and tech As of 2026, Google maintains an iron grip on the web browser market, boasting well over three billion Chrome users worldwide. That means even small changes or interruptions can have a significant impact. As security researcher Alexander "The Privacy Guy" Hanff noted in a blog post earlier this week, Google's web browser has been "silently" installing an AI model on users' devices without asking for consent. Hanff discovered a four-gigabyte file named "weights.bin," in a directory called "OptGuideOnDeviceModel." The file contains weights -- the learned numerical parameters of an AI model that teach it how to weigh the importance of various data points -- of Google's Gemini Nano, which is designed to live on users' devices, not the cloud. "Chrome did not ask," Hanff wrote. "Chrome does not surface it. If the user deletes it, Chrome re-downloads it." Plenty of questions remain over the implications of the download or how it affects the performance of users' devices beyond taking up a hefty amount of storage. But considering the lack of transparency -- and massively growing AI backlash -- it's certainly not a good look. Google has remained unusually silent on the matter, and has yet to publicly address it. The company didn't respond to Futurism's request for comment. Hanff argued that given the browser's billions of users, deploying the AI model could release "between six thousand and sixty thousand tonnes of CO2-equivalent emissions, depending on how many devices receive the push." Netizens, who have long grown wary of having AI pushed on them without their consent, were appalled. "AI/Climate aside, my real issue is that Google installs anything without my consent no matter the size," one Reddit user wrote. "Thankfully I don't use Chrome, it's Firefox for me." Others argued that Google was likely auto-installing the model to artificially inflate its own AI user stats. "All of this only so they can show the market that people really are 'using' their AI crap," one user wrote. "AI is so s*** that companies have to force it down people's throats," another argued. "They know nobody asked for this." "There were few things Google could do to force users off of Chrome faster than this," yet another seethed. As laid out in his blog post, Hanff found that the download of the file is triggered when the browser's default AI features are active. "On any machine that meets the hardware requirements, Chrome treats the user's hardware as a delivery target and writes the model," he wrote. To stop it from re-installing itself after deleting it, Hanff advised to disable AI features manually by digging into the browser's settings. "That is the true definition of malware," one X user charged. Beyond environmental concerns, Hanff argued that Google's apparent overreach could be in "direct breach" of European Union data privacy regulations, including General Data Protection Regulation, a comprehensive set of laws that went into effect in 2018. Google's Chrome isn't the only web browser that's landed in hot water after AI features came to light. Following a massive outcry among its users, browser company Mozilla promised a "kill switch" in Firefox that turns off all recently announced AI features. Luckily, plenty of other alternatives exist. For instance, competing browser company Vivaldi has taken a refreshingly different approach. In an August blog post, CEO Jon von Tetzchner vowed to take a stand, "choosing humans over hype." "We will continue building a browser for curious minds, power users, researchers, and anyone who values autonomy," he wrote at the time. "If AI contributes to that goal without stealing intellectual property, compromising privacy or the open web, we will use it. If it turns people into passive consumers, we will not."

Google responds to Chrome's silent Gemini Nano install, stops short of addressing consent

Chrome's GM says on-device AI is central to the browser's security strategy, but did not explain why deleting it triggers an automatic re-download. Google Chrome VP and GM Parisa Tabriz has responded to criticism over Chrome's practice of silently downloading a 4GB AI model onto users' devices, saying on-device AI is central to the browser's security and developer strategy. What triggered the backlash Privacy researcher Alexander Hanff recently documented the behavior, finding that Chrome automatically downloads Gemini Nano's model, which is around 4GB in size, on devices without prompting users or offering a clear opt-out. Deleting the file manually triggers an automatic re-download on the next Chrome restart. We recently covered the story and offered instructions on how to turn it off. The backlash intensified after critics pointed out a confusing inconsistency: Chrome's highly visible "AI Mode" feature in the address bar did not use the local model at all. Queries typed into it are sent to Google's cloud servers, meaning users absorb the storage and bandwidth cost of a 4GB file that has no connection to the browser's most prominent AI feature. Recommended Videos Privacy advocates have also raised concerns about potential violations of EU privacy law, specifically the ePrivacy Directive's requirement for user consent before storing data on a device. Google's response Tabriz acknowledged the behavior in a recent string of posts on X, clarifying that Google has been offering Gemini Nano in Chrome since 2024 "as a lightweight, on-device model," that's core to both Chrome's developer APIs and its security capabilities, including scam detection. She noted that the model processes data locally rather than sending it to Google's servers, and said it automatically uninstalls when a device is low on storage. Tabriz did not address the consent question directly, nor did she explain why the model reinstalls itself if a user deletes it. Google has said separately that users can disable and remove the model through Chrome's settings, and that once disabled, it will not re-download.

Chrome Is Quietly Installing a 4GB AI Model on Your Computer -- And Putting It Back If You Delete It - Decrypt

Privacy researcher Alexander Hanff argues the behavior violates the EU ePrivacy Directive. Check your Chrome user data folder. There's a decent chance a 4GB AI model is sitting there -- one you never agreed to install. The file is called weights.bin, buried in a folder named OptGuideOnDeviceModel. It's the weight file for Gemini Nano, Google's on-device language model. Delete it and Chrome downloads it again. Privacy researcher Alexander Hanff uncovered the behavior while running an automated audit on a fresh Chrome profile. Using macOS kernel filesystem logs, he traced Chrome creating a temp directory, pulling down model components, and placing the finished file on disk. The whole process took roughly 15 minutes. No notification. No prompt. The profile had received zero human input at any point. The same pattern has been confirmed on Windows 11, Apple Silicon Macs, and Ubuntu. Users who've been finding unexplained storage spikes for over a year now have a name for the culprit. Gemini Nano powers Chrome's on-device AI features: Things like "Help me write an email," scam detection, smart paste, page summarization, and AI-assisted tab grouping. On Windows, the file lands at %LOCALAPPDATA%\Google\Chrome\User Data\OptGuideOnDeviceModel\weights.bin. On Mac and Linux, it's the equivalent Chrome profile directory. Deleting the folder provides no permanent relief. Chrome restores it on the next restart unless you disable the feature -- via chrome://flags, the On-device AI toggle in Settings > System, or on Windows, a registry edit setting OptimizationGuideModelDownloading to disabled. Chrome recently added a prominent "AI Mode" pill in the address bar. A reasonable user seeing that button -- with a 4GB local model already on their disk -- would assume their queries stay on-device. They don't. AI Mode routes every query to Google's cloud servers. The local Gemini Nano model doesn't power it at all. You're paying the storage and bandwidth cost for a feature you're not actually using privately. Hanff argues Google is violating EU privacy law. His case centers on Article 5(3) of the ePrivacy Directive -- the same clause behind cookie consent banners -- which requires "prior, freely-given, specific, informed, and unambiguous consent" before storing anything on a user's device. He also cites GDPR Articles 5(1) and 25, covering transparency and privacy by design. He also drew a direct line to a case he published two weeks earlier: Anthropic's Claude Desktop silently pre-authorized browser automation across roughly three million user machines without explicit consent. It's the same pattern, he argued, but at a much smaller scale. However, Google has been sneaking Gemini Nano in Chrome for a while. People just didn't notice. "To provide an enhanced browser experience, Chrome uses on-device AI models to help power web and browser features," Google says in its Support Site. "Chrome may download on-device Generative AI models in the background, so features that rely on these on-device models stay ready for use. If you delete on-device AI models, only features that rely on them will be unavailable." "In February, we began rolling out the ability for users to easily turn off and remove the model directly in Chrome settings. Once disabled the model will no longer download or update." the company told Android Authority. The company noted the model auto-deletes if storage runs low. What Google didn't address is why users weren't asked first. Google's own Chrome developer documentation tells third-party developers it's "best practice to alert the user to the time required to perform these downloads." Google didn't follow its own advice this time.

Chrome's AI Might Be Taking Up a Bunch of Storage, but You Can Fix It

You can delete the file itself, but Chrome might just reinstall it if you keep these AI features turned on. Google Chrome is the most popular web browser in the world, but it isn't necessarily the most efficient. While Chrome offers users the most compatibility with Google's products and services -- not to mention a huge library of extensions -- it has a habit of hogging more system resources than other browsers, which may end up slowing down weaker hardware, or draining your laptop's battery. As it happens, the browser might also be responsible for putting a strain on your hard drive. As reported by The Verge, Google Chrome might be taking up more storage than it needs to on your Mac, PC, or Chromebook -- at least if you subscribe to one of Google's AI plans. That's due to its AI features, specifically Gemini Nano, Google's "lightweight" AI model used for scam detection, autofill, writing tools, and suggestions. It seems when a user has these AI features turned on, Chrome installs a 4GB "weights.bin" file to the browser directory. That's because Gemini Nano runs on-device, rather than in the cloud. In order to accomplish that, it needs resources on your computer to run its processes. It's not clear exactly what is causing this file to be so large, but it isn't necessarily surprising. AI processes can be intense, especially if the models are running on-device. Even though Gemini Nano is "light," 4GB sounds about right to me for the features highlighted here. There's actually an upside, too, since on-device processes are better for user privacy: For cloud-based processes, your data needs to leave your device, potentially exposing your information. Google's help center site mentions the features these models power, and discloses that Chrome will download files to run those processes, but doesn't specify the exact file size. If your computer has a large SSD or hard drive, you might not mind that added 4GB of storage -- especially if you like Gemini's features in Chrome. However, a lot of us don't have the storage space to spare, especially on machines with small hard drives to begin with. The entry-level MacBook Neo, for example, ships with 256GB of storage. Anyone who stores a local library of photos, videos, or other large files knows the challenge of trying to manage an SSD of this size. That 4GB of storage Chrome is taking up actually matters, particularly for users who do not rely on Google's AI features. As The Verge notes, you can delete the weights.bin file from the OptGuideOnDeviceModel directory on your computer. This will temporarily delete the 4GB of data, but it isn't a permanent solution. If you keep these AI features turned on, Chrome will just download the files again in the future, and your hard drive will be 4GB heavier. As such, your long-term solution is to disable these features instead. To do so, click the three dots in the top-right corner of a Chrome window, then hit "Settings." Here, head to "System," then make sure "On-device AI" is checked off. Note that this option may not be available if you aren't a Google AI subscriber, or if an organization like your school or company manages your Chrome profile. In these cases, Chrome likely didn't install the weights.bin file on your machine. For example, I don't have the option on either my personal Chrome profile or my work Chrome profile on my Mac.

Here's how I finally got Google's uninvited 4GB AI model off my Mac

Without notice or consent, Chrome has been downloading the hefty Gemini Nano model to run AI locally on your computer. Removing it can require minor surgery. My 2020 M1 MacBook Air still runs well, but conserving hard drive space as years of files, media, and software accumulate is a continual challenge. So I was miffed when I read security researcher Alexander Hanff's May 4 report that Google Chrome has been automatically downloading an over-4GB AI model called Gemini Nano onto everyone's computer, without asking for consent or providing notification. Chrome is not my main browser (I'm a Firefox diehard), and Gemini is not my main AI (that would be Claude). I'm paying a hefty hard-drive tax for something I don't use.

Google Chrome is installing a 4 GB AI model onto your device. Here's how you can turn it off

Chrome just decided your storage is fair game, no permission slip required. While Google Chrome is still the most popular browser, it's feeling the heat from the new wave of AI browsers, including Perplexity Comet, Dia, and more. To stay relevant, Google is adding new AI features to Chrome, which is not necessarily bad, however, this time it has taken a step too far. Open your file manager and look for a folder called "OptGuideOnDeviceModel". If you find it, Chrome has been using your storage as its personal server room. Inside that folder sits a file called "weights.bin", a roughly 4 GB file containing Gemini Nano, Google's on-device AI model. Recommended Videos Privacy professional Alexander Hanff discovered and documented this behavior using macOS's own filesystem event logs, which track every file created or modified at the operating system level. On a freshly created Chrome profile that received zero human input, the entire 4 GB model installed in under 15 minutes while a tab was just sitting there. Did anyone even ask for this? No, they didn't. In fact, Chrome doesn't even asks for permission to install the model, it just does it on its on. The model downloads automatically once Chrome decides your hardware meets its requirements, before you have ever used a single AI feature. And if you find and delete the file, Chrome re-downloads it the next time it runs. Hanff noted that "the user's deletion is treated as a transient state to be corrected, not as a directive to be respected." It gets more interesting. The most visible AI feature in Chrome, the "AI Mode" pill in the address bar, doesn't even use the local model. It sends your queries to Google Gemini servers. The on-device model powers buried features like "Help me write" in text boxes and on-device scam detection. What is the impact and how you can disable it? While this might seem like affecting only your device's storage, Hanff said that it has overarching climate impact. He estimates that if 500 million devices received this download, the bandwidth alone translates to roughly 30,000 tonnes of CO2 emissions, equivalent to around 6,500 cars running for an entire year, and that is just for the delivery, not actual usage. Google needs to make this download require a user confirmation. For now, you can disable the download using "chrome://flags". Search for "Enables optimization guide on device" and turn it off. It takes more steps than it should, but it works.

Google Chrome silently downloads a 4GB AI model on your PC without asking

It seems Google has decided that your PC needs a hefty dose of AI, whether you asked for it or not. Security researcher Alexander Hanff, also known as "That Privacy Guy," has published a new report claiming that Google Chrome silently downloads a roughly 4GB AI model onto users' machines without notice or consent. The file in question is called weights.bin, and it is part of Google's on-device Gemini Nano AI model. Chrome stores it inside a folder called OptGuideOnDeviceModel, located deep in your system's Chrome User Data directory. On Windows, that path is C>Users>AppData>Local>Google>Chrome>User Data. The model is used to power AI features like scam detection locally on your device, rather than sending your data to the cloud. Perhaps more concerning is what happens if you try to get rid of it. According to Hanff's research, deleting the file does nothing, as Chrome simply re-downloads it automatically. The only way to stop this is to disable the feature through Chrome's settings, which Google reportedly made available in February 2026. Once turned off, the model will no longer download or update. To conduct his testing, Hanff set up a fresh Chrome profile on macOS and used the OS's own filesystem event logs to track exactly what the browser was doing in the background. He found that Chrome evaluated the system's hardware, marked it as eligible, and downloaded the full 4GB payload in just over 14 minutes, all without any user interaction. Beyond the obvious privacy concerns about software being installed without consent, Hanff also argues that the practice likely violates EU privacy law, including the ePrivacy Directive and the GDPR. There is also an environmental angle to consider. Hanff estimates that if the model were deployed across hundreds of millions of Chrome users, the energy required just to distribute the file could reach hundreds of gigawatt-hours, translating to tens of thousands of tons of CO2 emissions. The math depends on assumptions about scale and energy requirements, but the broader point still stands. This is especially true for users on metered connections, mobile hotspots, or with limited data plans, where a silent 4GB download can have very real financial consequences. For Google, the timing is not ideal. The company is already facing antitrust scrutiny across multiple jurisdictions, and this discovery feeds into a familiar criticism that Big Tech enables features by default for its own benefit, burying the opt-out deep in settings menus. Whether regulators push back and how users respond will likely shape how aggressively Google and other companies can continue this kind of deployment going forward.

Google Chrome accused of silently installing Gemini Nano files

Computer scientist Alexander Hanff has alleged that Google's Chrome web browser downloads a 4GB file named "weights.bin" without user consent. This file reportedly contains data for Google's on-device large language model, Gemini Nano, which powers AI features such as "help me write" and scam detection. Hanff detailed his findings on his website, The Privacy Guy. He criticized Google's approach, noting that Chrome does not prompt users to install the Gemini Nano weights, which were found in a hidden folder within the macOS Library directory. He confirmed the presence of the 4GB file following the update to Chrome version 148.0.7778.97, and observed that it reappears after deletion. Google responded to the allegations, stating that Gemini Nano has been available in Chrome since 2024 and is designed to be a lightweight on-device model. "It powers important security capabilities like scam detection and developer APIs without sending your data to the cloud," the company said. Google indicated that the model automatically uninstalls if the device runs low on resources and noted that as of February, users can disable the model directly in Chrome settings. While Hanff did not observe the weights.bin file on a second Mac or a coworker's laptop, he reported similar download behavior on multiple Windows devices. "The user deletes, Chrome re-downloads; the only ways to make the deletion stick are to disable Chrome's AI features through chrome://flags or enterprise policy tools, or to uninstall Chrome entirely," Hanff stated. Further, Hanff raised concerns about compliance with European privacy laws, including the General Data Protection Regulation (GDPR). He also estimated significant environmental impact if the 4GB file is deployed to 500 million devices, noting it could lead to approximately 30,000 tonnes of CO2e emissions, equivalent to the annual emissions of 6,500 cars. Google's statement and clarification regarding the option to disable on-device AI tools came after the initial report, highlighting the ongoing discourse about data privacy and the environmental implications of large-scale software deployments.

Google defends Chrome's silent Gemini installs, but doesn't address the real issue

When not writing, Dave enjoys spending time with his family, running, playing the guitar, camping, and serving in his community. His favorite place is the Blue Ridge Mountains, and one day he hopes to retire there (hopefully his fear of heights will have retired by then, too!). Summary Chrome silently installs a 4GB file called weights.bin that's related to the Gemini Nano on-device AI model. The file will reappear if deleted, without ever asking for user permission. This is not the first instance of Chrome installing things without asking. A 4 GB Chrome file is stirring up quite a bit of controversy. Now, Chrome VP and General Manager Parisa Tabriz has addressed the file -- but the company is still ignoring the real issue. Related I changed one hidden Google Chrome setting and web browsing became instant Chrome can load pages before you click them, and with the right settings, the difference can be dramatic. Posts 5 By Amir Bohlooli What's going on, exactly? Just Google things The behavior causing so much controversy is Chrome's installation of a 4GB file called weights.bin. This 4 GB file is essentially the brain of Gemini Nano, an on-device AI model. The installation occurs silently, and if the file is found and deleted, Chrome will download it again. Although aggravating, this makes sense, since it's essential to Gemini Nano's functionality. This installation isn't new -- Chrome has been installing this file since 2024, according to Tabriz. However, the issue has gone a bit viral over the last few days thanks to a blog post by privacy expert Alexander Hanff. How to turn it off If you want the file gone for good, you can disable the behavior using Chrome flags: Type chrome://flags in the address bar. Search for "Enables optimization guide on device." Toggle the feature off in the dropdown menu (while you're in there, make sure to toggle this feature for faster downloads, too). Google's response In response to the negative press, Tabriz posted a thread on X explaining why the file is being installed. There, she says Gemini Nano is "a lightweight, on-device model. It powers important security capabilities like on-device scam detection and developer APIs without sending your data to the cloud." She also says the model will uninstall itself if storage space is running low. She then directs readers to a couple of Google sites to learn more. And that's it -- no mention of the elephant in the room. The real issue is that Google doesn't ask Let the users decide The problem here is not so much the file (although 4 GB isn't exactly small). The problem is that Google doesn't get consent before installing this stuff. A simple prompt asking whether we want to install would go a long way. Unfortunately, Google doesn't seem to want to acknowledge that it's an issue at all. Tabriz makes no mention of this behavior in her posts. Responders were quick to call it out, though: Not new behavior This isn't the first time this sort of thing has happened with Chrome. Back in the day, Chrome used to automatically install desktop shortcuts for Google web apps like Docs and Sheets without asking. On Mac, it was even more intrusive -- Chrome would install these into the Launchpad alongside all the other apps on your computer. Subscribe to our newsletter for Chrome privacy insights Discover why Chrome's 4GB weights.bin matters -- subscribe to the newsletter for clear coverage of privacy and consent issues, step-by-step fixes for intrusive installs, and wider browser behavior analysis. Get Updates By subscribing, you agree to receive newsletter and marketing emails, and accept our Terms of Use and Privacy Policy. You can unsubscribe anytime. There are more recent examples, too -- just the other day, I had a Gemini icon randomly appear in my Mac's Menu Bar. In other words, this Gemini Nano behavior isn't isolated, but a symptom of a larger problem. I use Chrome a lot, and Gemini in Chrome is great, but I really hope Google will address this in the near future. Have you run into any intrusive Chrome behaviors? Let us know in the comments below!

Google Chrome AI model: Is a 4GB file being downloaded without your permission? New report raises questions

A recent report has sparked concerns that Google Chrome may be installing a large AI model on users' devices without clear notice. The issue, highlighted by security researcher Alexander Hanff, raises questions about transparency, storage usage, and user consent. According to claims by a security researcher, the browser may be placing a large AI-related file almost 4GB onto certain computers without clearly notifying users beforehand. According to Hanff's report, Chrome analyzes a device's hardware before beginning the process. If the system meets the required specifications, the browser then proceeds to install the AI model automatically. Several users, the report suggests, may remain unaware of this activity until they detect reduced disk space or unusual increases in internet data consumption. To confirm his findings, Hanff carried out a controlled experiment on macOS. By creating a new Chrome profile and monitoring system-level activity logs, he tracked how the application functioned. His test featured that Chrome created a folder named OptGuideOnDeviceModel and downloaded the entire 4GB payload without any direct user interaction. The procedure reportedly took just over 14 minutes, after the system's compatibility had already been verified. The downloaded file is linked to Chrome's on-device AI features, that includes writing assistance tools and other built-in smart functions. These features function locally on the device rather than depending completely on cloud processing. However, reports suggest that the main AI features visible in Chrome, such as those in the address bar or search, are still powered by remote servers. This means some users may have the local model installed without actively using it. The AI model is stored in a directory labeled OptGuideOnDeviceModel. On Windows 11, users can reportedly situate it here: %LOCALAPPDATA%\Google\Chrome\User Data\OptGuideOnDeviceModel Due its large size, the file can occupy considerable storage space, mainly on devices with limited capacity. Deleting the folder may not completely resolve the issue. Hanff's findings indicate that Chrome can download the model again later unless certain internal settings are changed or the browser is entirely uninstalled. One possible method involves changing experimental settings:Still, some reports suggest that removing Chrome completely may be the only guaranteed solution. The report underscores the broader consequences of distributing such a large file worldwide. If millions of users receive a 4GB download, the total data transfer could escalate dramatically. Hanff estimated that widespread distribution could scale into petabytes or even exabytes, possibly increasing energy consumption and leading to higher carbon emissions. This could also impact users with limited or metered internet plans, where large background downloads may result in increased costs. As of now, Google has not issued any detailed public response addressing these specific claims. The lack of clarity has added to concerns among users and researchers. Q1. What is the Chrome AI download issue? It refers to reports that Chrome may install a large AI file in the background. Users may not be clearly notified before it happens. Q2. How big is the AI model? The reported file size is around 4GB. This can take up noticeable storage space on devices.