CSS Minifier

CSS minification is the process of removing unnecessary characters from CSS code without changing its functionality. This includes stripping comments, removing whitespace, eliminating line breaks and tabs, collapsing multiple spaces, removing the last semicolon before closing braces, and compressing spacing around selectors and properties. The result is a compact, single-line CSS file that's significantly smaller.

Minified CSS loads faster because there's less data to transfer over the network. For production websites, every kilobyte matters — especially on mobile connections and for first-paint performance metrics like LCP (Largest Contentful Paint) and FCP (First Contentful Paint). A typical CSS file can be reduced by 20–50% through minification alone, with no visual changes whatsoever.

This CSS minifier strips comments, whitespace, and redundant characters from your stylesheets instantly. It shows the original and minified file sizes with the percentage reduction, so you can see exactly how much space you're saving. All processing happens in your browser — your CSS never leaves your machine.

1. Paste your CSS — Copy your CSS code into the input field on the left. The tool accepts any valid CSS including media queries, keyframes, custom properties, and nested selectors.
2. Click "Minify" — The tool removes all comments, whitespace, line breaks, and unnecessary characters. The result appears in the output panel.
3. Check the stats — See the original size, minified size, and percentage reduction. Typical savings range from 20% to 50% depending on how formatted your original CSS is.
4. Copy the result — Click "Copy" to copy the minified CSS to your clipboard, ready to use in your production build or inline in HTML.

• Comment removal — Strips all CSS comments (/* ... */), including multi-line comments, license headers, and documentation comments.
• Whitespace compression — Removes all unnecessary spaces, tabs, newlines, and carriage returns. Collapses multiple spaces into single characters where needed.
• Syntax optimization — Removes spaces around {, }, :, ;, and , characters. Eliminates trailing semicolons before closing braces.
• Size comparison — Shows original and minified file sizes in bytes/KB with the percentage reduction, so you can quantify the optimization.
• Instant processing — Minification happens entirely in the browser with no upload delay, even for large stylesheets.
• 100% client-side — Your CSS code is processed locally in your browser. Nothing is sent to any server.

• Production deployment — Minify CSS before deploying to production to reduce page load times and improve Core Web Vitals scores.
• Inline critical CSS — Minify above-the-fold CSS for inlining in <style> tags to eliminate render-blocking requests and speed up first paint.
• Email templates — Minify inline CSS for HTML emails where every byte counts due to email client size limits (Gmail clips emails over 102KB).
• Quick one-off minification — Minify a CSS snippet without setting up a build tool when you need a quick, minified version for a small project or CodePen.
• Comparing build output — Paste your build tool's CSS output to verify it's properly minified, or compare manual minification with your bundler's output.