What is JavaScript minification?

Minification removes unnecessary characters (whitespace, comments) and optionally renames variables to shorter names, reducing JS file size without changing functionality.

Can I un-minify JavaScript code?

Yes! Paste minified JS and click Beautify to format it back to readable code.

Will minification break my JavaScript?

Basic whitespace/comment removal never breaks code. Variable renaming (uglification) can occasionally cause issues with eval() or reflection — test after minification.

Home›dev Tools›JS Minifier

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JavaScript Minifier — Minify JS Online Free

Compress JavaScript to Reduce File Size

Minify JavaScript code by removing whitespace, comments, and shortening variable names. Also beautify minified JS back to readable form. Smaller JS files load faster and improve Core Web Vitals scores.

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Instant

Seconds mein process

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Secure

Files never stored

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100% Free

No account needed