Making the web accessible for everyone using Chrome's built-in AI—completely offline and private.

An AI-powered Chrome extension that brings comprehensive web accessibility features to your browser: summarize articles, translate languages, simplify complex text, and proofread grammar. All powered by Chrome's built-in AI APIs with Gemini Nano, running entirely on-device for complete privacy.

Extract key points from long articles in seconds using the Summarizer API

• One-click summarization of entire webpages
• Bullet-point format for quick comprehension
• Perfect for research, news, and time-saving

Translate text into 20+ languages with the Translator API

• Spanish, French, German, Chinese, Japanese, Arabic, and more
• Select any text and get instant translations
• Works completely offline after initial setup
• No data sent to external servers

Transform complex content into easy-to-understand language using the Rewriter API

• Converts technical jargon to simple vocabulary
• Maintains original meaning while improving readability
• Ideal for students, non-native speakers, and accessibility

Correct spelling, grammar, and punctuation with the Proofreader API

• Professional-grade corrections
• Instant feedback for writing improvement
• Perfect for drafting responses and comments

AI-generated descriptions of images using the Prompt API

• Right-click any image for natural language descriptions
• Accessibility compliance with alt-text generation
• Multimodal understanding of visual content

• 🔒 100% Private: All AI processing happens on your device—no data ever leaves your computer
• ⚡ Works Offline: Once AI models download, everything works without internet
• 🌟 Accessible: Helps millions including students, researchers, non-native speakers, and people with disabilities
• 🚀 Fast: Near-instant results after initial model download
• 🆓 Open Source: MIT licensed, fully auditable codebase

• Chrome Canary (version 128+) or Chrome Dev Channel
• Chrome Built-in AI Early Preview Program enrollment
• Experimental flags enabled

1. Download Chrome Canary

   https://www.google.com/chrome/canary/
   

2. Join Chrome Built-in AI Early Preview Program

   https://developer.chrome.com/docs/ai/join-epp
   

3. Enable Required Flags

   • Navigate to: chrome://flags/#enable-experimental-web-platform-features
   • Set to: Enabled
   • Navigate to: chrome://flags/#optimization-guide-on-device-model
   • Set to: Enabled BypassPerfRequirement
   • Restart Chrome completely

4. Install Extension

   • Go to chrome://extensions/
   • Enable Developer mode (toggle in top right)
   • Click "Load unpacked"
   • Select this extension folder
   • Extension icon should appear in toolbar

5. First Use

   • On first feature use, Gemini Nano model will download (~10-60 seconds)
   • Progress displayed in UI
   • Subsequent uses are instant

1. Navigate to any article or webpage
2. Click the extension icon in toolbar
3. Click "Summarize Page" button
4. Key points appear in floating overlay (bottom-right)

1. Select any text on webpage
2. Click extension icon
3. Choose source and target languages
4. Click "Translate" button
5. Translation appears in overlay

1. Select complex text
2. Click extension icon
3. Click "Simplify Text" button
4. Simplified version appears in overlay

1. Select text to check
2. Click extension icon
3. Click "Proofread Text" button
4. Corrected version appears in overlay

1. Right-click on any image
2. Select "Analyze Image with AI"
3. Description appears in notification

This extension showcases 5 different Chrome Built-in AI APIs:

• Manifest V3 for modern Chrome extensions
• Content Scripts for page interaction
• Page MAIN World execution for AI API access
• Chrome Message Passing for component communication
• On-device Processing with Gemini Nano

• ✅ All AI runs locally on your device
• ✅ No data transmitted to external servers
• ✅ No tracking or analytics
• ✅ Works offline after model download
• ✅ Open source code (MIT License)

1. Summarization: Visit any news article → Click "Summarize Page"
2. Translation: Select Spanish text → Translate to English
3. Simplification: Select technical paragraph → Click "Simplify Text"
4. Proofreading: Select text with errors → Click "Proofread Text"
5. Offline Test: Disconnect internet → Repeat above (should still work)

• News: CNN.com, BBC.com
• Foreign Language: ElPais.com (Spanish)
• Technical: Wikipedia articles
• Any webpage with text content

• Ensure you've enabled both required flags (see Installation step 3)
• Restart Chrome completely (quit and reopen)
• Verify Chrome Canary version is 128+
• Check enrollment in Early Preview Program

• Normal! Gemini Nano model downloads on first use (10-60 seconds)
• Download happens once per API
• Watch for progress indicator in UI
• Subsequent uses are near-instant

• Check browser console for specific errors (F12 → Console tab)
• Verify extension is enabled in chrome://extensions/
• Reload extension after enabling flags
• Ensure you've clicked buttons (user activation required)

See detailed troubleshooting in the repository issues section.

• Lines of Code: ~400 JavaScript
• APIs Used: 5 Chrome Built-in AI APIs
• AI Model: Gemini Nano (on-device)
• Privacy: 100% local processing
• Offline: ✅ Full functionality
• License: MIT (Open Source)

Contributions welcome! This is an open-source project built for the Google Chrome Built-in AI Challenge 2025.

1. Fork this repository
2. Create feature branch (git checkout -b feature/AmazingFeature)
3. Commit changes (git commit -m 'Add AmazingFeature')
4. Push to branch (git push origin feature/AmazingFeature)
5. Open Pull Request

We actively encourage feedback! For the Most Valuable Feedback Prize, please test the extension and complete this form:

Chrome AI Feedback Form: https://forms.gle/V3QzcVcNMotTiYdd9

Your feedback helps improve Chrome's AI APIs for the entire developer community.

This project is licensed under the MIT License - see the LICENSE file for details.

Built for the Google Chrome Built-in AI Challenge 2025
Category: Most Helpful - Chrome Extension

• Google Chrome Team for Built-in AI APIs
• Chrome Built-in AI Early Preview Program
• Gemini Nano team for on-device AI capabilities

Made with ❤️ for web accessibility