CSS Minifier - Minify CSS Code Online Free

How to Use the CSS Minifier

1. Paste your CSS code into the input textarea — you can paste a snippet or an entire stylesheet
2. Click Minify — the tool instantly compresses your CSS by removing whitespace, comments, and redundant formatting
3. Review the comparison — see the original vs minified size and the percentage reduction
4. Copy the result — click the copy button to grab the minified CSS for immediate use
5. Replace in your workflow — use the minified version in your production build or deploy pipeline

Minifying CSS removes whitespace, comments, and redundant formatting to reduce file size. Smaller CSS files mean faster page loads and better Core Web Vitals scores. All processing happens in your browser.

Features

• Whitespace removal — strips all unnecessary spaces, tabs, and newlines
• Comment stripping — removes all /* */ comments safely
• Before/after comparison — side-by-side view of original and minified code
• Reduction percentage — see exactly how much smaller your file got
• One-click copy — copy the minified output to clipboard instantly
• Character/line count — see the exact savings in characters and lines
• Real-time option — auto-minifies as you paste (no button click needed if enabled)

Use Cases

• Production deployment — minify CSS before deploying to reduce page load time for end users
• WordPress optimization — run your theme’s style.css through the minifier, then enqueue the minified version
• Framework bundling — minify third-party CSS before bundling it with your build tool
• Email CSS — email clients strip external stylesheets; minified inline CSS helps stay within size limits
• CDN uploads — smaller files mean faster uploads and less bandwidth from your CDN

FAQ

Does minification change how my CSS works?

No. Minification only removes whitespace and comments — it does not change selectors, properties, or values. The rendered output is identical. The trade-off is readability, which is why you keep the original for development.

How much size reduction should I expect?

Typical CSS files shrink by 30-60% depending on how much whitespace and how many comments they contain. A 50KB stylesheet often drops to 20-30KB after minification.

What about CSS variables and modern syntax?

The minifier preserves all CSS content including custom properties (variables), @media queries, @keyframes animations, clamp(), min(), max(), and all modern CSS features. It only removes formatting.

Should I minify all my CSS files?

Best practice is to minify CSS used in production. For development, keep the original readable version. Most build tools (webpack, Vite, Parcel) can automate minification as part of your build step.

Is this the same as CSS obfuscation?

No. Minification compresses the file size but does not change class names, selectors, or structure. CSS obfuscation would rename classes and restructure selectors to make the code harder to read — this tool only compresses.