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CSS Minifier

Minify CSS stylesheets for production

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CSS Minifier strips whitespace, comments, and redundant characters from a stylesheet to produce the smallest possible file for production — the same rules, just packed tighter, with no change in how the page renders.

Paste your CSS here

How to use CSS Minifier

  1. 1

    Paste your CSS into the input box.

  2. 2

    The minifier compresses it instantly, removing whitespace and comments.

  3. 3

    Compare the before/after size shown on screen.

  4. 4

    Copy the minified CSS to your clipboard.

Everything you need to know about minifying CSS

What does minifying do?

Strips whitespace, comments, and unnecessary characters from a stylesheet, producing the smallest functionally-identical file — a direct, if modest, page-load performance win since browsers download CSS before rendering.

When you actually need this

  • Shipping production CSS without a full build pipeline already handling it.
  • Quick size comparisons before and after minification.

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Frequently Asked Questions

Will minifying change how my page looks?

No — minifying only removes whitespace, comments and redundant characters. Every rule and selector still applies exactly as before.

How much smaller will my CSS get?

It varies with how much whitespace and repetition the original has, but stylesheets with a lot of utility classes often shrink 20–30% from minification alone.

Do I need this if I already use a build tool?

No — Vite, webpack and similar bundlers already minify CSS in production builds. This tool is for a standalone stylesheet served without a build step.

Can I reverse it and get readable CSS back?

Yes — use CSS Formatter to re-indent a minified stylesheet for editing.

Does this tool send my CSS anywhere?

Yes — the CSS you paste is sent to our servers to be minified and the result is returned to you; we don't store the content itself.

Is this tool free to use?

Yes — completely free, with no signup required.