mtools.lol

JavaScript Minifier

Minify JavaScript to make files smaller and pages faster.

How it works

  1. 1Paste your JavaScript.
  2. 2It is minified as you type.
  3. 3Copy or download the result.

Features

  • Shows the size before and after.
  • Variables renamed, dead code removed.
  • Errors reported clearly.
  • Private: runs in your browser.

Frequently asked questions

Is it safe?

Terser renames local variables and removes dead code without changing behaviour. License comments (/*! ... */) are kept.

Can I undo it?

Use the JavaScript Formatter to make minified code readable again (renamed variables stay renamed).

Is my data sent anywhere?

No. Everything runs in your browser; nothing is uploaded.

Related tools

JavaScript FormatterBeautify JavaScript with consistent indentation using Prettier.JSON MinifierRemove all whitespace from JSON to make it as small as possible.CSS MinifierMinify CSS to make files smaller and pages faster.Base64 DecoderDecode Base64 (standard or URL-safe) back to text.