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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.

⚡
Instant
Seconds to process
🔒
Secure
Files never stored
🆓
100% Free
No account needed
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How to Use JS Minifier

1

Paste your JavaScript code

2

Click Minify to compress or Beautify to format

3

Copy minified JS output

Frequently Asked Questions

Minification removes unnecessary characters (whitespace, comments) and optionally renames variables to shorter names, reducing JS file size without changing functionality.
Yes! Paste minified JS and click Beautify to format it back to readable code.
Basic whitespace/comment removal never breaks code. Variable renaming (uglification) can occasionally cause issues with eval() or reflection — test after minification.

Learn More

tutorial
Why Minifying CSS Can Break Your Layout (calc(), !important, and Other Gotchas)
5 min read

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