Code PlaygroundNothing uploadedNo sign-upNo watermark

Run Code In Your Browser

Write and run HTML, JavaScript or Python without installing anything. Everything executes on your own machine — no server, no account.

1Pick a language
2Write your code
3Press Run

HTML editor

18 lines

Preview

Press Run to render your page

A Code Playground With No Server Behind It

Online editors send every keystroke to a build container. ModiFyX runs HTML and JavaScript in a sandboxed frame and Python on WebAssembly, entirely on your device.

Your Code Stays HereNothing is sent to a build server. The code runs in your own browser and is never stored.

Three LanguagesHTML with live preview, JavaScript with a real console, and full CPython.

Real PythonPyodide is CPython compiled to WebAssembly — the standard library is all there.

Properly SandboxedCode runs in an opaque-origin iframe, so it cannot touch this page, your cookies or your storage.

No Sign-UpNo account, no project limit and no waiting for a container to spin up.

Offline After First LoadHTML and JavaScript need no download at all; Python caches after the first run.

A Code Playground With No Server Behind It

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