Notion Equation Converter

A Chrome extension that converts LaTeX block equations \[ \] and \( \) to inline equations (unrendered) $ $ in Notion pages.

🚀 Features

• One-click conversion of all \[equation\] and \(equation\) patterns to $equation$
• Real-time auto-conversion as you type
• Smart filtering - ignores empty brackets \[\] or \( \) and whitespace-only patterns
• Works on all Notion pages (notion.so and notion.site)
• Simple and lightweight - no permissions beyond active tab
• Preserves equation content - only changes the delimiters

📥 Installation

From Chrome Web Store

1. Visit the Chrome Web Store page
2. Click "Add to Chrome"
3. Confirm installation

From Source (Development)

1. Clone this repository:

git clone https://github.com/davidwkk/notion-equation-converter.git

2. Open Chrome and go to chrome://extensions/
3. Enable "Developer mode" (top right)
4. Click "Load unpacked" and select the src folder

🎯 Usage

Basic Usage

1. Open any Notion page
2. Type equations using \[ and \] or \( and \):

The quadratic formula is \[x = \frac{-b \pm \sqrt{b^2-4ac}}{2a}\]
Einstein's famous equation is \(E = mc^2\)

3. Click the extension icon in your toolbar
4. Click "Convert [ ] and ( ) to $ $"
5. Your equations are now in inline syntax:

The quadratic formula is $x = \frac{-b \pm \sqrt{b^2-4ac}}{2a}$
Einstein's famous equation is $E = mc^2$

6. Manually select the equation and use shortcut to make it rendered.
   • Shortcut: ctrl/cmd + shift + E

Auto-Convert Mode

Toggle "Auto Convert" in the popup to automatically convert \[ \] and \( \) to $ $ as you type. Empty brackets like \[\] or \( \) are ignored.

Before & After

Before:

\[E = mc^2\]
\(F = ma\)

After:

$E = mc^2$
$F = ma$

🛠️ Technical Details

• Manifest Version: 3
• Permissions: activeTab, storage
• Content Scripts: Runs on *.notion.so/* and *.notion.site/*
• Framework: Vanilla JavaScript
• Regex Pattern: /\\\[(\s*\S[\s\S]*?)\\\]/g and /\\\((\s*\S[\s\S]*?)\\\)/g - captures content with at least one non-whitespace character

🤝 Contributing

1. Fork the repository
2. Create a feature branch: git checkout -b feature-name
3. Make your changes
4. Test thoroughly
5. Submit a pull request

Development Setup

# Clone the repo
git clone https://github.com/davidwkk/notion-equation-converter.git
cd notion-equation-converter

# Load in Chrome for testing
# Go to chrome://extensions/, enable Developer mode, click "Load unpacked"

🚀 Future Development Plan

Auto-Rendering Feature

• Goal: Automatically render equations after conversion from \[ \] to $ $
• Current State: Users need to manually select and use ctrl/cmd + shift + E to render
• Target: Eliminate manual rendering step for seamless equation conversion
• Technical Challenge: Automatically trigger Notion's equation rendering after conversion

📝 Changelog

Version 1.0

• Initial release
• Basic equation conversion functionality
• Chrome extension popup interface

Auto-Convert Toggle (v1.1)

• New toggle in the popup for real-time auto-conversion
• Default: OFF (manual one-click conversion only)
• When enabled, any newly typed \[ ... \] is immediately changed to $ ... $
• Enhanced regex: Now ignores empty/whitespace-only brackets for better accuracy
• Improved performance: Better text node filtering and mutation handling

Security Enhancement (v1.2)

• Removed unnecessary scripting permission to improve security and privacy
• Minimal permissions now only include activeTab and storage
• Better extension hygiene by following Chrome Web Store best practices

Parentheses Support (v1.3)

• Added support for \( ... \) delimiters in addition to \[ ... \]
• Updated UI to reflect support for both delimiter types
• Enhanced regex patterns for both bracket and parentheses formats
• Improved documentation with examples for both delimiter types

🐛 Issues & Support

• Bug Reports: GitHub Issues
• Feature Requests: GitHub Discussions

📄 License

MIT License - see LICENSE file for details.

🙏 Acknowledgments

• Built for the Notion community
• Thanks to all contributors and users

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Made with ❤️ for Notion users who love math