CSS/JS Minifier
Minify CSS and JavaScript
CSS/JS Minifier: Reduce File Size for Production
Minifying CSS and JavaScript removes whitespace, comments, unused variables, and shortens names, reducing file size 30-60% without affecting functionality. Direct impact on web performance: less to download = faster page = better SEO ranking (Google prioritizes fast sites).
Our minifier uses cssnano (CSS) and terser (JS) — the same tools that Vercel, Netlify, and webpack use internally. Configurable options: minify aggressively, preserve important comments (/*! */), keep console.log for debugging.
For developers who don't have a build pipeline set up, sites without npm/webpack, or quick prototypes. Everything runs in the browser without dependencies.
How does it work?
- 1Paste your CSS or JS
The tool detects the language automatically. Files up to 5 MB supported.
- 2Adjust options
Aggressive minification, preserve comments, keep function names (for stack traces).
- 3Download the minified version
Compare original size vs minified. Copy to clipboard or download as .min.css/.min.js
Frequently Asked Questions
Depending on the code: CSS typically reduces 40-50%, JS 30-60%. Combined with gzip (server usually applies), total impact is 70-85% less transferred bytes. On slow connections, this is the difference between 3s and 1s load time.
Yes. Gzip and minification are complementary. Minified files compress better with gzip (fewer patterns to encode). Combining both gives you the smallest possible size.
In JS, if you use eval() or Function constructor with variable names as strings, aggressive minification can break it (variables get renamed but strings don't). In CSS, very rare. Terser and cssnano are safe with normal code.