Free CSS and JavaScript minifier tools. Learn how minification reduces file sizes, improves page speed, and helps your SEO. Minify your web code in one click.
When you write CSS and JavaScript, you use indentation, comments, and descriptive variable names. These make code readable for humans but add bytes that browsers don't need. Minification removes everything unnecessary - whitespace, comments, and redundant syntax - without changing how the code works.
How Much Smaller Can You Get
Typical minification reduces file sizes by 30-60%. A 100KB JavaScript file might minify to 40KB. On a slow mobile connection, that's seconds of load time saved. For sites serving thousands of visitors, it's significant bandwidth savings too.
Our CSS Minifier and JavaScript Minifier do this instantly.
Should You Always Minify
For production, yes. For development, no - keep the readable versions for debugging. Most build tools (Webpack, Vite, Gulp) include minification as a build step. But if you're working on a simple site without a build pipeline, these online tools are the quickest way to optimise your code.
There's also an HTML Minifier for stripping unnecessary whitespace and comments from HTML files. Run all three on your production code for maximum benefit.