JavaScript Minify

Paste your JavaScript into the box above and the minified 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 strips whitespace, comments and other unneeded characters from your JavaScript to make it as small as possible. Smaller files load and transfer faster, which is useful before shipping to production.

No. A proper JavaScript minifier only removes characters that do not affect how the code runs — whitespace, comments and redundant syntax — so the minified output behaves exactly like the original. You can always keep your readable source and ship only the minified version.

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.