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Write code.
See it run.

A fast, free code editor in your browser. HTML, CSS, JavaScript, Python, and Swift — with live preview, autocomplete, and instant error feedback.

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index.html — Code Playground

<h1>Hello World</h1> <p class="intro"> Start building something. </p> <style> h1 { color: #5ce0d0; font-size: 2rem; } .intro { color: #94a3b8; } </style>

Hello World

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Everything you need to code

No downloads, no configuration. Open the editor and start building.

Live Preview

See your HTML and CSS changes instantly. CSS updates without reloading — form state and scroll position stay where they are.

Web & Backend Development

Build with HTML, CSS, and JavaScript for the web. Run Python directly in the browser for backend logic, data, and scripting. Full terminal output with error highlighting.

Smart Editing

IntelliSense-style autocomplete for all five languages. Emmet abbreviations, code folding, bracket matching, and format-on-save — all built in.

Inline Errors

When your code has a bug, the exact line is highlighted with the error message right there in the editor.

Light & Dark Themes

Toggle between dark and light themes with full syntax highlighting for every language. Your preference saves automatically.

Mobile Ready

Responsive layout that works on phones and tablets. Hamburger sidebar, Code/Output toggle, and touch-friendly controls.

Write code.See it run.