CSS & JS Minifier

Free online CSS & JS Minifier tool to compress, reduce file size, and optimize your CSS and JavaScript code.

Input Code

Output Code

Why Use a CSS & JS Minifier?

Minifying your CSS and JavaScript files is essential for modern web development. By removing unnecessary characters like whitespace, comments, and line breaks, minification significantly reduces file sizes without changing functionality. This optimization directly impacts your websites performance, leading to faster load times and improved user experience.

Smaller file sizes mean less data transfer between your server and users browsers. This is particularly crucial for mobile users on slower connections or those with limited data plans. Every kilobyte saved translates to faster page loads, which can dramatically reduce bounce rates and increase user engagement.

Why Minification is Important

Website performance is a critical ranking factor for search engines, especially Google. Page speed directly influences your SEO rankings, with faster sites receiving preferential treatment in search results. Minified CSS and JavaScript files contribute to faster Time to First Byte (TTFB), First Contentful Paint (FCP), and overall page load times - all metrics that search engines evaluate.

Beyond SEO benefits, minification improves Core Web Vitals scores, which measure real-world user experience. Better scores lead to higher conversion rates, lower bounce rates, and increased revenue. Studies show that even a one-second delay in page load time can result in significant drops in conversions and customer satisfaction.

For developers working with modern frameworks and libraries, minification is crucial for production deployments. Development code often includes extensive comments, formatting, and debugging aids that are unnecessary in production. Minification strips these away while preserving functionality, creating lean, efficient code that performs optimally.

How Our Minifier Works

Our CSS and JavaScript minifier uses intelligent algorithms to compress your code while maintaining full functionality. The tool performs several optimization techniques simultaneously to achieve maximum file size reduction.

For CSS minification: The tool removes all comments, strips unnecessary whitespace, eliminates redundant semicolons, and compresses property declarations. It intelligently preserves required spaces around operators while removing everything else, resulting in compact, production-ready CSS.

For JavaScript minification: The process removes both single-line and multi-line comments, eliminates whitespace and line breaks, and compresses operators and punctuation. The minifier carefully maintains code logic and structure while creating the smallest possible file size.

Beautification feature: Our tool also includes a beautify function that does the opposite - it formats minified code into human-readable format with proper indentation and line breaks. This is invaluable when you need to debug or modify minified code from external sources.

All processing happens instantly in your browser with no server uploads, ensuring your code remains private and secure. The tool provides real-time statistics showing original size, output size, and percentage reduction, helping you understand the optimization impact immediately.

Best Practices for Code Minification

Always keep original files: Maintain unminified versions of your code for development and debugging. Use minified versions only in production.

Combine with other optimizations: Pair minification with gzip compression, CDN delivery, and HTTP/2 for maximum performance gains.

Test after minification: Always verify that your minified code works correctly before deploying to production environments.

Use source maps: For JavaScript, consider generating source maps to enable easier debugging of minified production code.

Automate the process: Integrate minification into your build process using tools like Webpack, Gulp, or Grunt for consistent optimization.