How it works

Updated October 29, 2026

Private Writing Assistant never sends your writing to a server. The AI that checks and rewrites it is Chrome Built-in AI, which runs on your own computer.

1. 1

   You write

   In any text field on a website, such as an email draft or a Google Doc.

2. 2

   Your computer checks

   The extension hands each sentence to Chrome Built-in AI, which runs locally. The language is detected locally too.

3. 3

   You decide

   Mistakes are underlined. You apply a fix, fix everything at once, or rewrite a selection.

What stays on your device

• Everything you write on websites
• The suggestions and rewrites the model makes
• The addresses of the pages you write on
• Your settings, such as the websites where you turned checking off

What can leave your device

Only two things, and neither contains the text you write on websites:

• Usage stats: which features you use, the website's name (for example mail.google.com), Chrome's language, the language checked, the extension version and a random ID. They are on by default, and the “Share usage stats” switch in settings turns them off.
• Feedback you send through the “Send feedback” form, only when you press Send.

The privacy policy has the full details.

It works offline

Because the model runs on your computer, checking and rewriting keep working without an internet connection once the model is downloaded.

What is Chrome Built-in AI?

Chrome Built-in AI is Google's set of AI models and APIs built into the Chrome browser. The model is downloaded once and then runs on your computer, so web pages and extensions can use AI without sending text to a server. Chrome decides which computers can run it; see Will it run on my computer?

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