Chrome reportedly preinstalled a ~4GB on-device Gemini Nano model on many systems

Google’s Chrome browser has been placing Gemini Nano, its on-device language model, onto some desktop systems as part of the company’s built-in AI rollout, according to Chrome developer documentation and Google support pages. The model has drawn attention in recent days after users and publishers reported finding a file of roughly 4 GB on local drives, often under Chrome component folders. Google says the model supports local AI features, including scam detection and developer-facing APIs, and that it can be downloaded in the background so those tools are ready when needed. The dispute has centered less on remote data collection than on how clearly Chrome told users a large model might be stored locally. ### Where did this file come from? Google’s developer documentation says Chrome manages Gemini Nano downloads automatically when built-in AI features are invoked. A page titled “Understand built-in model management in Chrome,” published on the Chrome for Developers site in October 2025, says the initial download is triggered by the first call to a built-in AI API that depends on Gemini Nano. (developer.chrome.com) The same documentation says some `availability` checks can also trigger a download shortly after a fresh profile starts if Gemini Nano-powered scam detection is active. Google says the process can continue after a tab is closed and can resume on the next browser restart within 30 days. ### How big is the model, and which machines qualify? Google’s Prompt API documentation says Gemini Nano’s “exact size may vary” as Chrome updates the model. (developer.chrome.com) That page does not give a single fixed download size, but it says users need at least 22 GB of free space on the volume containing the Chrome profile before APIs that use Gemini Nano will work. The same page says supported systems include Windows 10 and 11, macOS 13 and later, Linux, and Chromebook Plus devices on supported ChromeOS versions. (developer.chrome.com) It says Chrome for Android, iOS and non-Chromebook Plus ChromeOS devices are not supported for the APIs that use Gemini Nano. Hardware requirements include either more than 4 GB of VRAM on GPU systems or at least 16 GB of RAM and four CPU cores for CPU inference. (developer.chrome.com) ### Why would Chrome want Gemini Nano on the device at all? Google’s Chrome and security materials say Gemini Nano is used for on-device features rather than only cloud-based AI responses. Google said in a May 2025 scam advisory that Chrome had added AI-powered protection using the on-device Gemini Nano large language model to help guard users from dangerous sites. A separate Google blog post on scam prevention said Chrome’s Enhanced Protection uses Gemini Nano for added scam defense. (developer.chrome.com) Google has also promoted Gemini Nano as infrastructure for browser-managed AI APIs that web developers can call from websites and applications. Chrome’s built-in AI documentation says the browser “provides and manages foundation and expert models,” including Gemini Nano. ### Was there a user-facing notice before the download? CNET reported in May 2026 that many users likely received no clear warning before Chrome stored a large AI model locally. (blog.google) Ars Technica reported that the model itself was not new, but said users’ confusion was understandable because Chrome was still causing it to appear on machines for the first time. (developer.chrome.com) Google’s own support language says Chrome “may download on-device Generative AI models in the background” so features that rely on them “stay ready for use.” That phrasing confirms background delivery, but it does not describe a separate consent prompt in the support text surfaced by Google Help. ### Can users remove it? Google’s Chrome Help page says users can manage on-device generative AI models in browser settings. (cnet.com) The page says deleting those models will make only the features that rely on them unavailable. Reports published this week said Google has also been rolling out a setting that lets users disable and remove the Gemini Nano model directly in Chrome. Google has said that once turned off, the model will no longer download or update, according to reporting that cited the company’s response. (support.google.com) ### What happens next for Chrome users? Google’s current Chrome Help and developer pages indicate the issue is now moving into settings and support documentation rather than a one-time product launch. (support.google.com) Users who want to check whether Gemini Nano is present can review Chrome’s on-device internals and model-management pages referenced in Google’s documentation, while enterprises can use policies that disable the feature and trigger model deletion, according to the Chrome developer docs. (msn.com) (developer.chrome.com)