What does minifying do?

Minification removes comments, unnecessary whitespace, and newlines from source code to reduce file size. Smaller files transfer faster over the network and improve page load times. The code still runs identically — only formatting is removed.

Is HTML minification safe?

This tool uses conservative HTML minification: it strips HTML comments (preserving IE conditionals like ), collapses runs of whitespace between tags, and trims leading/trailing space. It intentionally leaves the contents of , , , and blocks untouched. This avoids the edge cases that aggressive minifiers can introduce.

How is JavaScript minified?

JavaScript is minified using Terser, an industry-standard ES2020+ minifier. Terser renames local variables to shorter identifiers, removes dead code, and compresses expressions — producing significantly smaller output than whitespace-only removal.

CSS is minified using CSSO, a structural CSS optimizer. CSSO removes comments, collapses whitespace, merges identical rules, and shortens property values where safe to do so.

Is my code sent to a server?

No. All processing happens in your browser via dynamic imports. Your code never leaves your device.

Code Minifier & Beautifier

Developer Tools· 34 tools

Free online code minifier and beautifier. Paste HTML, CSS, JavaScript, or JSON and choose Minify to strip whitespace and compress, or Beautify to format with consistent indentation. See the byte-size difference and percentage saved. Runs entirely in your browser — nothing is sent to a server. Powered by js-beautify, Terser, and CSSO.

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Frequently Asked Questions

References

Terser — JavaScript minifier — Terser
js-beautify — Code beautifier for JS, CSS, and HTML — beautifier.io

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Frequently Asked Questions

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