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CSS & JS Minifier

Minify CSS and JavaScript to reduce file size

Input

Minified (45% smaller)

.button{color:red;padding:10px}

What is this tool?

Minifies CSS and JavaScript to reduce file size by removing comments and unnecessary whitespace — the JS minification is deliberately conservative, avoiding aggressive changes that risk breaking working code.

How to use it

Paste your CSS or JavaScript, and the minified version is generated automatically, with a size comparison shown.

For full JavaScript minification with variable renaming and dead-code elimination, a build-tool minifier like esbuild or Terser will go further than this browser-based tool intentionally does — this one prioritizes never corrupting your code over squeezing out the last few bytes.