CSS Minifier Online
Compress your CSS stylesheets instantly with this free online minifier. All processing runs client-side in your browser — your code never leaves your device.
Code Minifier & Beautifier
Minify or beautify JavaScript, CSS, and HTML code instantly. No data leaves your browser.
About Code Minification & Beautification
Beautify reformats your code with proper indentation, line breaks, and spacing for maximum readability. Great for reading minified production code or cleaning up messy formatting.
Minify removes all unnecessary whitespace, comments, and formatting to produce the smallest possible output. Minified code loads faster and uses less bandwidth — essential for production deployments.
JavaScript: Handles string literals (single, double, template), comments (single-line and multi-line), regex literals, and all modern syntax. Preserves semicolons and statement structure.
CSS: Handles selectors, declarations, at-rules (@media, @keyframes), comments, and nested structures. Collapses whitespace around delimiters for maximum compression.
HTML: Handles all standard tags, void elements (br, img, input, etc.), comments, DOCTYPE declarations, and embedded script/style content. Preserves content within pre and textarea tags.
What is CSS minification?
CSS minification removes unnecessary whitespace, comments, semicolons, and redundant declarations from stylesheets. The result is a smaller file that browsers parse identically to the original. Minifying CSS is one of the simplest performance optimizations and is recommended by Google PageSpeed Insights and Lighthouse audits.
Common use cases
Web developers minify CSS before deploying to production to reduce page load times. It is especially impactful for large stylesheets, CSS frameworks, and sites serving users on slow connections. Many build tools like Webpack and Vite include CSS minification, but this online tool is perfect for quick one-off compressions without setting up a build pipeline.
Frequently Asked Questions
Will minifying CSS change how my page looks?
No. CSS minification only removes characters that have no effect on rendering, such as whitespace, comments, and trailing semicolons. Your page will look exactly the same.
Should I minify CSS in development or production?
Only in production. During development, keep CSS readable for easier debugging. Minify as part of your production build step, or use this tool to quickly minify before deploying.