CSS Minifier
Minify CSS by removing whitespace and comments — reduce file size.
How to Minify CSS
Paste your CSS stylesheet into the input area and click "Minify CSS". The tool strips comments, removes unnecessary whitespace and line breaks, eliminates redundant semicolons, and produces compact output that renders identically in browsers.
Why Minify CSS?
CSS files are render-blocking resources — browsers must download and parse them before displaying a page. Minification reduces CSS file size by 15-40%, which directly improves page load times and Core Web Vitals scores. It's a standard best practice for production websites.
Is This Tool Free?
Yes, 100% free. Your CSS is processed entirely in your browser and never uploaded to any server.
Frequently Asked Questions
What does CSS minification do?
It removes whitespace, comments, and unnecessary characters from CSS stylesheets. This produces smaller files that download faster, improving website performance.
How much can I save by minifying CSS?
Typically 20-35%, depending on how formatted your CSS is. For large frameworks like Bootstrap, savings can be significant.
Is my CSS code uploaded?
No. All processing happens in your browser. Your stylesheets never leave your device — safe for proprietary code.
Does it handle media queries and keyframes?
Yes, the minifier correctly processes all valid CSS including media queries, @keyframes, custom properties, and nested rules.
Why is CSS minification important for SEO?
Google uses Core Web Vitals (LCP, FID, CLS) as ranking signals. Smaller CSS files load faster, improving these metrics and potentially boosting your search rankings.