Skip to content
FreeToolConvert

HTML / CSS / JS Minifier & Beautifier

Minify or beautify HTML, CSS and JavaScript. JavaScript is minified with Terser (with optional compression and name mangling); beautifying uses js-beautify.

In-browser · no upload HTML, CSS, JS → HTML, CSS, JS

Runs entirely in your browser. Your files and text are not uploaded to our servers.

To minify code, choose the language, paste your code and select Minify; the size saving is shown. To make minified code readable again, select Beautify. For JavaScript, tick “compress & shorten names” for the smallest output.

How to use the HTML / CSS / JS Minifier & Beautifier

  1. 1

    Pick HTML, CSS or JavaScript

  2. 2

    Paste code or open a file

  3. 3

    Minify or beautify

    Then copy or download.

How it works

JavaScript is parsed by Terser, a real JavaScript minifier, so syntax errors are reported with the line number and the output is always valid code. CSS minification removes comments and whitespace and shortens zero values; HTML minification collapses whitespace and removes comments while leaving <pre>, <textarea>, <script> and <style> contents untouched. Licence comments (/*! … */) are kept.

Features

  • Safe JS minification

    Real parser, not regex.

  • Readable beautify

    Choose 2, 4 spaces or tabs.

  • Licence comments kept

    /*! and @license comments survive.

Privacy and file handling

Where it runs
Runs in your browser

Runs entirely in your browser. Your files and text are not uploaded to our servers.

Limitations

  • HTML minification is conservative (whitespace and comments only).
  • Name mangling can break code that relies on function names (e.g. reflection).

Frequently asked questions

Is my code uploaded?

No. Minifying and beautifying happen in your browser.

Was this tool helpful?

Thanks for the feedback.

Last reviewed