CSS Minifier

Paste your CSS code below to minify it. Removes comments, whitespace, and unnecessary characters to reduce file size.

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Click "Minify CSS" to see the result

About the CSS Minifier

CSS minification is the process of removing unnecessary characters from CSS source code without changing its functionality. This includes stripping comments, eliminating whitespace, removing unnecessary semicolons and empty rules, and shortening color values where possible. The result is a smaller file that browsers can download faster, improving your website's overall performance and user experience.

How to Use

Paste your CSS code into the input area and click the "Minify CSS" button. The tool will instantly process your stylesheet and display the minified version below, along with statistics showing the original size, minified size, and percentage savings. You can then copy the minified CSS to your clipboard and use it in your production builds. The entire process happens in your browser — your CSS is never uploaded to any server.

What Does Minification Remove?

  • Comments: Both single-line and multi-line CSS comments (/* ... */) are removed entirely since browsers ignore them.
  • Whitespace: Spaces, tabs, and newlines between selectors, properties, and values are stripped to the minimum necessary.
  • Trailing semicolons: The last semicolon in a declaration block is removed since it is optional in CSS.
  • Empty rules: Selectors with no declarations are removed completely.
  • Redundant units: Values of 0px, 0em, etc. are simplified to 0.

Why Minify CSS?

Page load speed is a critical factor for both user experience and search engine rankings. Google has confirmed that site speed is a ranking signal, and studies show that even a 100-millisecond delay in load time can reduce conversion rates. CSS files are render-blocking resources — the browser cannot paint the page until all CSS is downloaded and parsed. By reducing CSS file sizes by 20-50% through minification, you directly improve the critical rendering path and time to first paint.

While CSS minification is typically part of a build pipeline (using tools like PostCSS, cssnano, or build tools like Webpack and Vite), this online tool is useful for quick one-off minifications, testing how much space you can save, or minifying CSS snippets for inline use. It is also a great educational tool for understanding what minification actually does to your code and how much overhead comments and formatting add to your stylesheets.