About Code Runner
Code Runner is a free, open-source online code editor that allows you to write and execute HTML, CSS, and JavaScript code in real-time. Perfect for learning, testing, and sharing code snippets.
Fast & Lightweight
Runs entirely in your browser with no server-side processing, making it incredibly fast and responsive.
Privacy Focused
Your code never leaves your browser. We don't track, analyze, or store your work on our servers.
Dark/Light Mode
Choose your preferred theme with our easy toggle. Your preference is saved for future visits.
Auto-Save
Your work is automatically saved in your browser, so you can pick up right where you left off.
Our Mission
We created Code Runner to provide developers with a simple, no-frills environment to:
- Quickly test code ideas
- Learn web development fundamentals
- Troubleshoot code snippets
- Share working examples with others
How It Works
Code Runner uses your browser's built-in capabilities to:
- Interpret your HTML, CSS, and JavaScript code
- Render the results in a secure sandbox
- Store your work locally in your browser
Support the Project
Code Runner is completely free to use. If you find it valuable, please consider:
- Buying us a coffee to support development
- Sharing with your friends and colleagues
- Contributing to the open-source project