Free Online Code Editor – Write HTML, CSS & JavaScript with Live Preview
Build websites directly in your browser using our powerful 3-pane code editor. Perfect for students learning web development, developers testing code snippets, and educators creating interactive demos. See changes instantly with live preview – no downloads or installations needed.
Why Choose Our Web Development Editor?
Create functional prototypes and test ideas faster with these features:
- Real-time code preview – See results as you type
- Three-pane interface – Edit HTML, CSS & JS simultaneously
- Mobile-responsive design – Test layouts on different screen sizes
- Beginner-friendly – Start with preloaded template code
- 100% browser-based – No software installation required
- Free forever – No hidden costs or premium tiers
How to Use the Online Code Playground
Follow these simple steps to create your first web project:
Edit HTML (Structure)
- Modify the template in the left panel
- Add elements like buttons, images, or forms
Style with CSS (Design)
- Customize colors, fonts, and layouts
- Center content or create responsive grids
Add Functionality (Behavior)
- Write JavaScript for interactivity
- Create click handlers, animations, or form validation
Test Instantly
- Click RUN ► to refresh the preview
- Interact with your creation in real-time
Key Features for Better Coding
Live Preview Window
- Immediate visual feedback for every code change
- Interactive testing of buttons/forms/animations
- Mobile view toggle (coming soon)
Error-Resistant Design
- Automatic code validation
- Syntax highlighting for readability
- Auto-closing tags/brackets
Collaboration Tools
- Save and share projects via unique URLs
- Export full project as ZIP file
- Print code directly from browser
Common Uses & Learning Scenarios
For Students
- Practice HTML/CSS fundamentals
- Debug JavaScript homework assignments
- Create portfolio projects for coding bootcamps
For Developers
- Test new CSS frameworks
- Prototype UI components quickly
- Validate third-party code snippets
For Educators
- Demonstrate web concepts live
- Create interactive coding exercises
- Provide visual code examples
Technical Specifications
| Feature | Details |
|---|---|
| Supported Code | HTML5, CSS3, ES6+ JavaScript |
| Preview | Updated every 2 seconds |
| Max File Size | 500KB per panel |
| Export Options | ZIP, TXT, or Shareable Link |
| Compatibility | Chrome, Firefox, Edge, Safari |
Frequently Asked Questions
Is my code stored anywhere?
No – all work stays in your browser unless you choose to save/export.
Can I use external libraries?
Yes! Add CDN links in the HTML head section for Bootstrap, jQuery, etc.
Why doesn’t my animation work?
Check browser console for errors (right-click preview > Inspect).
How do I save progress?
Bookmark page or use Export > Save as ZIP features.
Try Our Other Development Tools
[Fake Data Generator] – [Color Picker] – [Image Optimizer]