Best FreeOnline Tools

Chrome Built-in AI

Grammar + Tone Fixer

Improve writing quality with Google Chrome's built-in AI APIs.

If you see "Built-in AI API is unavailable"

Some Chrome versions require experimental feature flags before this API works.

  1. Open chrome://flags in Google Chrome.
  2. Enable #prompt-api-for-gemini-nano.
  3. Enable #optimization-guide-on-device-model.
  4. Relaunch Chrome and open this tool again.

Need detailed help? Read our full setup guide: How to Enable Chrome Built-in AI APIs for Grammar + Tone Fixing.

About This AI Grammar & Tone Fixer

This AI Grammar & Tone Fixerharnesses the power of Google Chrome's experimental on-device AI API (Gemini Nano) to instantly proofread, rewrite, and improve your text. Unlike traditional cloud-based AI writers that require expensive subscriptions, this tool runs your text through an AI model locally on your machine, ensuring 100% privacy with zero server latency.

Who is it for?

  • Professionals & Executives: Quickly convert aggressive or casual drafts into polished, professional emails.
  • Non-Native English Speakers: Instantly check for awkward phrasing and correct complex grammatical mistakes.
  • Content Creators: Iterate on social media captions and blog post intros using different tonal presets.

Common Use Cases

  • Email Polishing: Taking bullet points and converting them into a well-structured, polite message.
  • Simplifying Complex Text: Rewriting dense academic or technical jargon so a general audience can understand it.
  • Expanding Short Notes: Turning brief ideas into fully fleshed-out paragraphs with the click of a button.

Frequently Asked Questions (FAQ)

Is my text sent to a server?

No. This tool specifically relies on the window.ai API available in newer versions of Google Chrome. The AI model is downloaded to your browser and runs directly on your hardware, meaning no internet connection is required after setup.

Why does it say the API is unavailable?

Currently, Google Chrome's Built-in AI is an experimental feature. You need to enable specific experimental flags (like Document Prompt API and Gemini Nano) in your browser settings. See the setup guide linked above for step-by-step instructions.

Is this tool free?

Yes, completely free. Because the AI inference happens on your own computer, we don't have to pay for expensive API server costs, so we pass those savings on to you.

Related Writing Tools

Enhance your writing workflow with our other text utilities: