CSS Minifier
Free online CSS minifier to minify CSS and compress stylesheets instantly. Paste your code and remove whitespace, comments, and redundant rules in one click.
About this tool
This online CSS optimizer compresses your stylesheet for production by stripping out whitespace, blank lines, and comments. Any verbose or development-ready CSS is reduced to the smallest possible size in one click. Smaller stylesheets mean faster page loads, lower bandwidth costs, and better scores on Lighthouse and Core Web Vitals. Paste your CSS, click minify, and get production-ready output in seconds.
Use Cases
- Production DeploymentReduce stylesheet file size before deploying to production for faster page loads and lower bandwidth usage.
- Email TemplatesMinify inline CSS in email templates to keep message size small and improve deliverability.
- Lighthouse & Core Web VitalsSmaller CSS payloads directly reduce render-blocking time and improve First Contentful Paint scores.
How It Works
Paste Your CSS
Copy and paste your CSS source code into the editor.
Click Minify
Press the Minify CSS button and the tool will compress the code instantly.
Copy the Result
Copy the minified output or start over with new code.
Questions & Answers
No. All minification is done entirely in your browser. Your code never leaves your device.
No. The minifier only removes whitespace and comments that have no effect on rendering. The output is functionally identical to the original.
If the CSS cannot be parsed, the tool will display an error message so you can identify and fix the issue before minifying.