Optimize your stylesheets for performance and speed with our free online CSS minifier. This tool removes unnecessary whitespace, comments, and formatting to create a compact version of your code ready for production use.
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Tip
Use the CSS Formatter if you need to edit a file that was previously minified.
Did You Know?
Minification can reduce CSS file sizes by an average of 15% to 25% depending on the original formatting.
CSS (Cascading Style Sheets) is the standard stylesheet language used to describe the presentation and layout of web pages. While developers use spaces, indentation, and comments to make code maintainable and readable, these elements are ignored by web browsers. CSS minification streamlines the code for production, ensuring the browser receives only what is necessary to render the design, which is critical for performance-focused web development.
Best Practice
Always use a build script to automate minification so your source code remains readable for your team.
cssnano plugin in your Vite, Webpack, or Rollup configurations for automatic minification.gulp-clean-css into your Gulp workflows to automate asset optimization during deployment.clean-css-cli tool to minify files via the terminal in your continuous integration (CI/CD) pipelines.Q: Will minifying my CSS change how my website looks? A: No, minification only removes non-functional characters like whitespace and comments; the visual output of your styles will remain identical.
Q: Can I restore minified CSS back to its original readable format? A: Minification is a one-way process designed for production. To make code readable again, you should use our CSS Formatter.
Q: Does this tool support CSS variables and modern syntax? A: Yes, our minifier supports modern CSS3 features, including custom properties (variables), grid, and flexbox.
Q: Should I minify CSS during development? A: It is best practice to keep readable source files for development and only use minified files for your production environment.