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KioTools
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  • Runs locally

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CSS Minifier & Beautifier

What is this tool?

A CSS minifier and beautifier that runs in your browser. It is token-aware enough to leave strings, url() values and the contents of comments alone, but it is intentionally conservative rather than a full CSS parser.

When to use it

  • Shrinking a stylesheet before shipping it, when you don't have a build step
  • Making a minified stylesheet readable so you can understand or edit it
  • Cleaning up inconsistent indentation in hand-written CSS
  • Quickly checking how much smaller a stylesheet gets when minified
  • Tidying a snippet copied from dev tools

How to use it

  1. 1Paste your CSS into the input box
  2. 2Choose Minify or Beautify
  3. 3Read the result, with the size reduction shown when minifying
  4. 4Copy the output with the Copy button
  5. 5Switch modes to go the other way on the same input

Frequently asked questions

Will it break my CSS?

It avoids touching strings, url() values and anything it can't confidently parse, so it's safe for normal stylesheets — but always test the output before deploying.

Does it optimise values (like shortening colours)?

No — this is whitespace and comment handling only. It doesn't rewrite property values or merge rules.

Does it work on SCSS or LESS?

It's built for plain CSS. Pre-processor syntax may pass through but isn't specifically supported.

Is my CSS uploaded?

No — formatting happens entirely in your browser.