CSS Minifier

The CSS Minifier compresses your stylesheet by removing comments and stripping out every piece of unnecessary whitespace, producing a compact file that downloads faster. The rules and values that control your design are all preserved, but the indentation, blank lines and spacing that make CSS readable are removed to save bytes.

It is aimed at developers shipping stylesheets to production, where a smaller CSS file means a quicker first render for visitors and less bandwidth used on every page load. It is equally handy for anyone who wants a compact version of a stylesheet to embed inline in a page or store as a string.

Everything runs locally in your browser using JavaScript, so the CSS you paste is never uploaded, logged or stored. That lets you minify proprietary design systems and unreleased styles without any of them leaving your own device.

Features

• Removes all CSS comments so developer notes never ship to production.
• Collapses whitespace and newlines so the stylesheet becomes a single compact block.
• Tightens spacing around braces, colons, semicolons and combinators without breaking rules.
• Drops the redundant final semicolon before each closing brace to shave extra bytes.
• Reports the original and minified character counts plus the percentage of size you saved.
• Handles whole stylesheets including media queries and nested at-rules.
• Copies the minified CSS or downloads it as a file ready to deploy.

How to use CSS Minifier

1. Paste your CSS stylesheet into the input box.
2. The tool instantly removes comments and collapses the whitespace.
3. Check the statistics to see how many characters and what percentage you saved.
4. Copy the minified CSS or download it as a file.
5. Deploy the compact stylesheet or embed it inline in your page.

Benefits

• Smaller stylesheets download faster, improving load time and perceived performance.
• Leaner CSS reduces bandwidth usage across every page load on a busy site.
• Removing comments strips internal notes before the stylesheet reaches production.
• Compact CSS is easy to inline in a page or store as a string in code.
• The size statistics quantify exactly how much smaller the stylesheet became.
• Because minification is local, proprietary styles never leave your own device.

CSS whitespace is purely for developers, so removing it is a safe, lossless way to shrink a stylesheet. Browsers parse the compact form identically to the readable one, which means a minified stylesheet renders exactly the same design while transferring fewer bytes over the network. On large sites those saved bytes add up across millions of page loads.

The minifier also tightens the spacing that sits around structural characters, so the space after a colon, around a brace or beside a combinator like the child selector is removed where it is not needed. It additionally drops the last semicolon before a closing brace, which is always optional in CSS, squeezing out a little more size without any risk to how the rules behave.

This is a whitespace and comment minifier rather than a full optimiser, so it does not merge duplicate rules, shorten colour values or reorder properties. That conservative scope keeps the output completely predictable and identical in behaviour to the source. For the smallest possible transfer size, pair the minified file with server-side gzip or Brotli compression, which compounds neatly on top of minification.