CSS Minifier

Minify CSS by removing comments, whitespace, and unnecessary characters. Reduce CSS file size instantly.

Last updated: June 1, 2026

Input CSS

Minified CSS

What is CSS Minifier?

A CSS minifier removes all unnecessary characters from CSS code — whitespace, comments, newlines, and redundant semicolons — without changing functionality. This produces the smallest possible file size for production deployment. Smaller CSS files mean faster page loads, reduced bandwidth costs, and better Core Web Vitals scores. A typical CSS file can be reduced 20-40% through minification alone, and the savings compound across multiple stylesheets loaded on every page view.

How It Works

The tool parses your CSS and removes all content that doesn't affect rendering: comments (/* */), extra whitespace between rules and declarations, newlines and tabs used for formatting, trailing semicolons in declaration blocks, and redundant units (0px → 0). It preserves all functional content — selectors, properties, values, media queries, and important whitespace within values (like calc() expressions). The output is valid CSS that renders identically in all browsers.

Common Use Cases

•Preparing CSS files for production deployment to minimize download size
•Optimizing critical CSS for above-the-fold content to improve First Contentful Paint
•Reducing CSS payload size for mobile users on slower network connections
•Minifying inline CSS before embedding in HTML email templates
•Optimizing third-party CSS libraries before including them in production builds
•Reducing the total transfer size of web applications to meet performance budgets