JavaScript Obfuscator

Paste your JavaScript into the box above and the obfuscate JavaScript appears instantly below — nothing to press, nothing to upload. It runs entirely in your browser, so it is fast and private, and you can copy the output or download it as a file.

Yes. It is completely free with no signup or limits, and it is private because everything happens locally in your browser — your code is never sent to a server. That makes it safe for proprietary or unreleased code, and it keeps working offline once the page has loaded.

It transforms your JavaScript into a functionally-identical but hard-to-read version, to make casual copying and reverse-engineering harder. Note that obfuscation is a deterrent, not true security — anyone determined can still run the code.

No — the obfuscated code runs identically to the original; only its readability changes. You get the same functionality with harder-to-read output.

There is no fixed limit because nothing is uploaded — the only constraint is your device's memory, so even large files process quickly on a normal computer. The engine loads on first use and is cached afterwards, so repeat runs are instant.

Yes. It runs in any modern browser on Windows, Mac, Linux, iPhone and Android with nothing to install, and works offline once loaded. The result can be copied or downloaded on any device.