Does this minifier work for both JS and CSS?

Yes. Use the JS and CSS toggle to switch between modes. JavaScript minification removes comments and whitespace. CSS minification additionally shortens hex colours and removes redundant semicolons.

How much size reduction can I expect?

Typical reduction is 20-40% for well-commented code, and 10-20% for already-compact code. The main gains come from removing whitespace and comments. For maximum compression, combine with gzip which typically achieves another 60-70% on top.

JS & CSS Minifier — Minify JavaScript and CSS Online

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About the JS & CSS Minifier

Minification removes all characters from code that aren't necessary for it to execute — whitespace, comments, and long variable names can all be shortened. The result is a smaller file that loads faster in browsers.

What this minifier does

Removes single-line (//) and multi-line (/* */) comments
Collapses whitespace and newlines
Removes spaces around operators and punctuation
CSS only: shortens 6-digit hex colours to 3-digit where possible
CSS only: removes trailing semicolons before closing braces

All processing runs in your browser — no code is sent to any server.

Frequently Asked Questions

Does this work for both JS and CSS?

Yes. Toggle between JS and CSS mode. Both remove whitespace and comments; CSS mode also shortens hex colours and removes redundant semicolons.

Is the minified code safe to use?

Yes for typical code. For complex production builds with frameworks, a full bundler like webpack or esbuild is recommended as it also handles imports and tree-shaking.

How much smaller will my file be?

Typically 20–40% for well-commented code. Combined with gzip compression on the server, total reduction can reach 70–80%.

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