Is this the same as uglifying JavaScript?

Basic minification removes whitespace and comments. Full uglification also renames variables to shorter names and performs dead-code elimination. This tool performs whitespace and comment removal — safe for any JS.

Will minification break my JavaScript?

Whitespace-only minification is completely safe and will not break any valid JavaScript. If you notice issues, it is likely due to missing semicolons in the original code — a best practice regardless of minification.

Can I beautify minified third-party libraries?

Yes. This is useful for debugging or understanding minified code from external libraries. Keep in mind that variable names may still be shortened if the original was fully uglified.

Should I commit minified JS to version control?

No — always commit the original source files. Minification should be a build step. Use tools like Vite, Webpack, or esbuild to automatically produce minified output during deployment.

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JavaScript Minifier & Beautifier

Minify JavaScript to reduce bundle size or beautify minified JS for readability. Free browser-based JavaScript formatter.

About this tool

Minify JavaScript to reduce file size and improve page load speed, or beautify compressed JS to make it readable again for debugging. See exact byte savings after minification.

💡 This is a basic JS formatter. For production use, consider tools like Terser (minify) or Prettier (beautify) which handle all edge cases.

Input JavaScript

Output