HTML/CSS/JS Live Editor
A tiny in-browser playground — write HTML, CSS and JS and see the result update live in a sandboxed preview, no account or build step.
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A Playground With No Setup
Type in the HTML, CSS and JS tabs and the preview below updates as you type — it runs entirely in your browser, in a sandboxed iframe that can't access this page or your data. Handy for testing a snippet, prototyping a component, or checking how a bit of CSS actually renders before dropping it into a real project.
This is plain-text editing (no syntax highlighting) by design, to keep the tool fast and free of any external editor library.
Frequently Asked Questions
Is my code sent anywhere?
No — everything runs locally in your browser. The preview is rendered in a sandboxed iframe on this same page; nothing is uploaded or saved on a server.
Why no syntax highlighting?
Adding a real code editor (syntax highlighting, autocomplete) means loading a heavy third-party editor library. This tool stays deliberately lightweight — plain textareas, instant load, zero dependencies.
Is the preview safe to run untrusted code in?
The preview iframe uses sandbox="allow-scripts" without allow-same-origin, so scripts inside it cannot read cookies, local storage, or anything else from this page — it's isolated the same way an untrusted embed would be.
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HTML/CSS/JS Live Editor