JavaScript Minifier
Minify JavaScript with Terser: remove whitespace and comments, compress and shorten variable names. Free and private: runs in your browser.
Paste JavaScript to get production-ready minified code and see the size saving.
Runs entirely in your browser. Nothing you paste is uploaded or stored.
Use cases
- Clean up code or data before sharing it in a ticket or pull request.
- Make minified output readable while debugging.
- Shrink files before deploying.
Frequently asked questions
Will minification break my code?
Terser is safe for standard JavaScript. Code that relies on function or class names at runtime may need "Minify only" mode.
Is the JavaScript Minifier free?
Yes. It is free with no sign-up, and it runs entirely in your browser, so your input is never uploaded or stored.
Will formatting change how my code behaves?
Formatting only changes whitespace and layout. Minifying removes comments and whitespace and may shorten names, so keep the original source in version control.
Related tools
Checking one snippet is a start. Scan your whole repository for free with CodeInspector.