HTML/CSS/JS Playground (Live Preview)
A free in-browser playground for HTML, CSS, and JavaScript. Edit in three CodeMirror panels with a sandboxed live preview. Download as a single .html file. 100% client-side.
Edits auto-save in your browser. Nothing is uploaded.
About this playground
Three CodeMirror editors plus a sandboxed preview iframe. Your code runs locally in the iframe — nothing is uploaded to any server. Your edits persist in your browser via localStorage per the keys stacckapp-playground-html, -css, -js.
About HTML/CSS/JS Playground (Live Preview)
The HTML/CSS/JS Playground gives you three CodeMirror editors for markup, styles, and scripts. Type into any panel and the sandboxed preview pane re-renders so you can see the result. When you are happy with it, use the download button to save everything as a single self-contained .html file.
Frequently asked questions
- Is my code saved on a server?
- The editing and preview happen client-side in your browser; code is processed by the page itself rather than stored in an account.
- Can I export my work?
- Yes. The download button produces one .html file containing the HTML, CSS, and JavaScript together, which you can open or share.
- Does the preview run JavaScript?
- Yes. The preview is a sandboxed iframe that executes your JavaScript so you can test interactive behavior.