CSS Minifier
Quickly and easily minify CSS code to speed up website load times. Paste your CSS Code below.
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Why Minify CSS?
CSS minification strips whitespace, comments, and redundant characters from stylesheets — cutting file size 20–40% without changing how the page looks or behaves.
What Gets Removed
- Whitespace & line breaks between rules and declarations
- Comments —
/* */blocks not needed in production - Redundant semicolons — the last one before
} - Zero units —
0pxbecomes0 - Unnecessary quotes around font names
PageSpeed Impact
- Smaller CSS → faster browser parse time
- Fewer bytes = lower LCP (Largest Contentful Paint)
- Reduces mobile data usage
- Directly improves Google Core Web Vitals score
How much does CSS minification reduce file size?
Typical CSS files shrink 20–35%. Heavily commented or Sass-generated CSS can shrink 40–50%. Minification works best combined with gzip/Brotli server compression.
Can minification break CSS?
Properly implemented minification never breaks valid CSS — it only removes formatting characters. The most common pitfall is aggressive minifiers mangling calc() expressions; this tool handles that safely.
Should I minify in development?
No — develop with readable CSS and minify only for production builds. Use source maps alongside your minified files so browser DevTools can still display readable line numbers when debugging.