Some Chrome AI reads your words on your own machine. Some of it posts your open page to Google's servers the moment you click. This page grades every feature by where its work actually happens — and shows the three controls that decide most of your real exposure.
Ask 'is Chrome AI private?' and you will get confident answers in both directions — because the question is wrong. Chrome AI is two different products wearing one name. One half runs a model stored on your PC and processes your text locally. The other half is a set of cloud services that send your pages, prompts and tab lists to Google. This page separates the two, feature by feature, using how Google documents and builds them — so you can switch off the sharing without throwing away the parts that never shared anything.
Every AI feature in Chrome does its thinking in one of two places. On-device features run a model stored on your own PC — your text never has to leave the machine for the feature to work. Cloud features send the relevant content to Google's servers, where the big models live. Almost every privacy question about Chrome AI reduces to knowing which kind you are using.
The split is not guesswork — it follows from how Google built and documents these features. Here is the honest grading, feature by feature.
Help me write and History search powered by AI run on Gemini Nano, the model Chrome downloads to your PC. When you ask for a paragraph rephrased or search your history in plain words, that processing happens locally — the draft text and the history question are handled on your machine.
Google also says the same on-device model helps Chrome's enhanced protection spot scam pages locally. The privacy bargain here is real but not free: the model itself can occupy up to roughly 4 GB of disk, downloaded from Google whether you ever use the features or not. Local processing, cloud-sized luggage.
The moment you chat with Gemini in Chrome, the content you share — your current tab by default, and any tabs you add — is sent to Google so Gemini can read and answer about it. AI Mode answers are likewise generated on Google's servers; the button sitting in your address bar is a doorway to cloud search, not to the model on your disk.
Create themes with AI sends your theme description to Google and the picture is generated server-side. The tab organizer similarly needs Google's servers to study your open tabs and propose groups. None of this is secret wrongdoing — it is simply how these four features are built, and it is exactly the information you need to decide which ones to keep.
Google's own enterprise documentation lists the starting defaults plainly. For managed browsers, the default is: features allowed, but their data is not used to improve Google's models. For consumer Chrome — your home PC — the default is: features allowed and their data may be used to improve the models.
In other words, the office PC in the corner starts life more private than the laptop on your sofa, purely because nobody changed your laptop's defaults. Switching off the cloud features you do not use — or turning off their data-sharing permissions — is how a home user closes that gap.
Out of everything in Chrome's settings, three controls decide most of your real exposure:
chrome://settings/ai/gemini, under Permissions. This single switch ends the habit of your open page being handed to Gemini automaticallyThe video opens the Gemini permissions most users never find — page sharing, location and microphone — and sets them properly, live.
▶️ Watch Full VideoWhere the feature is offered, it runs on Chrome's on-device model, so the drafting and rephrasing are processed on your own PC rather than sent to a server for generation. The model's download — up to roughly 4 GB on eligible machines — is the main cost of that arrangement.
By Google's own documentation, your current tab is shared with Gemini by default when you open it, and Gemini answers using that page's content. You can end the automatic sharing by turning off Share current tab by default in the Gemini in Chrome settings, under Permissions, and still share a specific tab manually whenever you choose.
By Google's enterprise documentation, yes — managed browsers default to allowing AI features without using their data to improve Google's models, while consumer Chrome defaults to allowing features and using data to improve the models. Home users close the gap by switching off cloud features they do not use and reviewing the Gemini permissions page.