🛠ToolsHub
🔍

CSS Minifier

🔒 In your browser

Compress CSS to reduce file size and speed up page loads.

How it works

Compress CSS by removing whitespace, comments and redundant values — smaller files mean faster page loads. Powered by CSSO, running in your browser.

Try an example

Minified CSS
—

🔒 Generated entirely in your browser — nothing is uploaded.

🔒 Runs in your browser: tags, sitemaps and minification are generated locally from what you type — nothing is uploaded, no signup, no limits.

About the CSS Minifier

This free CSS minifier compresses your stylesheets by removing whitespace, comments and redundant values — smaller CSS downloads faster and improves page load times. It's powered by CSSO and runs entirely in your browser.

Your CSS is never uploaded.

How to use it

  • Paste your CSS.
  • The minified result and the size saved appear instantly.
  • Copy it into your production stylesheet or build output.

Minification vs. compression

They're different and stack. Minification shrinks the source itself — stripping whitespace, comments and redundant values. Compression (gzip or Brotli, applied by your server) then squeezes the bytes further in transit. Doing both gives the smallest download. Keep your readable source for editing and minify as a build step or before deploying, since minified CSS is hard to edit by hand.

Frequently asked questions

How does CSS minification work?

It strips comments and whitespace and simplifies values — for example shortening colours and collapsing redundant zeros — without changing how the styles render.

Is the minified CSS safe to use?

Yes. CSSO produces output that renders identically to your source; only characters that don't affect the result are removed.

Should I keep my original CSS?

Yes — keep the readable source for editing and minify as part of your build or before deploying. Minified CSS is hard to edit by hand.

Is my CSS uploaded?

No. It's minified in your browser.

Will minifying change how my styles render?

No. CSSO only removes characters that don't affect the result and simplifies equivalent values, so the minified stylesheet renders identically to your source.

Related searches

css minifierminify csscss compressorcompress css onlinereduce css sizecsso online

Learn more

Related SEO tools

HTML MinifierJavaScript MinifierMeta Tag GeneratorOpen Graph GeneratorTwitter Card Generator
🔗 Embed this tool on your website — free

Copy this and paste it into your page's HTML. The tool runs in the visitor's browser, just like here. Change height to fit, or add the optional auto-resize snippet below. Add ?theme=dark to the URL for dark mode.

<iframe src="https://toolhq.dev/embed/css-minifier/" title="CSS Minifier — ToolsHub" width="100%" height="520" style="border:1px solid #e5e7eb;border-radius:12px;max-width:680px" loading="lazy"></iframe>
Optional: auto-resize the iframe height

Add this once on the same page so the iframe grows to fit the tool:

<script>
addEventListener("message", function (e) {
  if (e.data && e.data.type === "toolshub:resize") {
    document.querySelectorAll('iframe[src*="/embed/"]').forEach(function (f) {
      if (f.contentWindow === e.source) f.style.height = e.data.height + "px";
    });
  }
});
</script>