GitHub PR Diff to Markdown

A Chrome extension that adds a "Copy Diff" button to GitHub Pull Requests, allowing you to instantly copy the PR diff in markdown format - perfect for AI code reviews and documentation.

🚀 Features

• One-Click Copy: Adds a seamless "Copy Diff" button next to the "Review changes" button on GitHub PRs
• AI-Ready Format: Exports diffs in markdown format, optimized for AI code review tools like ChatGPT, Claude, or Copilot
• Customizable Prompts: Configure your own system prompt to guide AI reviews (e.g., focus on security, performance, or specific coding standards)
• Smart Integration: Automatically fetches PR metadata (title, repository, PR number) along with the diff
• No API Keys Required: Works directly with GitHub's interface - no authentication needed

📦 Installation

From Chrome Web Store (Recommended)

Coming soon!

Manual Installation (Developer Mode)

1. Download the extension

   git clone https://github.com/jordanmiguel/get-pr-diff.git
   cd get-pr-diff

2. Install in Chrome

   • Open Chrome and go to chrome://extensions/
   • Enable "Developer mode" (toggle in top right)
   • Click "Load unpacked"
   • Select the get-pr-diff folder

🎯 Usage

1. Navigate to any GitHub Pull Request
2. Click on the "Files changed" tab
3. Find the "Copy Diff" button (appears left of "Review changes")
4. Click to copy - The entire PR diff is now in your clipboard in markdown format
5. Paste into your favorite AI tool for instant code review

⚙️ Configuration

Customizing the AI Prompt

1. Click the extension icon in your Chrome toolbar
2. Edit the default prompt to match your review needs
3. Click "Save Settings"

Default prompt includes:

• Focus areas: bugs, security, performance, code quality
• Response format with file-specific feedback
• Guidelines for constructive reviews

Example Custom Prompts

Security-Focused:

You're a security expert reviewing code for vulnerabilities.
Focus on: SQL injection, XSS, authentication issues, data exposure...

Performance Review:

Analyze this PR for performance implications.
Look for: N+1 queries, unnecessary loops, memory leaks...

📋 Output Format

The extension copies PR information in this structure:

[Your configured system prompt]

# Pull Request: [PR Title]

**Repository:** owner/repo  
**PR Number:** #123  
**URL:** https://github.com/owner/repo/pull/123

## Diff

```diff
[Full PR diff with + and - indicators]

🛠️ Technical Details

Architecture

• Content Script: Injects the button and handles diff fetching
• Background Script: Manages CORS-free network requests
• Popup: Settings interface for prompt customization
• Storage: Chrome sync storage for settings persistence

Permissions

• activeTab: Access to current GitHub tab
• clipboardWrite: Copy formatted diff to clipboard
• storage: Save user preferences
• Host permissions for github.com and patch-diff.githubusercontent.com

🤝 Contributing

Contributions are welcome! Please feel free to submit a Pull Request. For major changes, please open an issue first to discuss what you would like to change.

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

🐛 Known Issues

• The button only appears on the "Files changed" tab
• Large diffs (>10MB) may take a moment to copy
• Some GitHub Enterprise instances may require additional configuration

📄 License

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

🙏 Acknowledgments

• Inspired by the need for better AI-assisted code reviews
• Built for developers who love efficient workflows
• Special thanks to all contributors and users

📞 Support

• Issues: GitHub Issues
• Discussions: GitHub Discussions

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Made with ❤️ for developers who value their time