CSS Minifier

Compress your CSS code to reduce file size and improve website load speed. 100% Client-side.

Input CSS 0 B

Minified Output

0 B

Original: 0 B Minified: 0 B Savings: 0%

How to Use the CSS Minifier

This CSS Minifier is a robust, logic-heavy tool designed to parse and compress Cascading Style Sheets (CSS) directly in your browser. Unlike simple text replacers, this tool intelligently handles CSS syntax, preserving strings, data URIs, and complex `calc()` functions while aggressively stripping unnecessary characters.

Step-by-Step Guide

Paste Code: Copy your raw CSS code from your editor (VS Code, Sublime, etc.) and paste it into the left "Input CSS" panel.
Configure Options: Use the checkboxes at the top to customize the minification level. By default, the tool removes comments, unnecessary whitespace, and trailing semicolons inside blocks.
Minify: Click the blue "Minify CSS" button. The optimized code will instantly appear in the right panel.
Copy & Deploy: Click the "Copy" button in the output header to save the code to your clipboard, ready to be pasted into your project (e.g., as `style.min.css`).

Why Minify? Minification can reduce CSS file sizes by 20% to 50%. This directly improves your website's First Contentful Paint (FCP) and overall SEO score by reducing the data the browser needs to download and parse.

Understanding CSS Minification Logic

Minification is the process of removing all unnecessary characters from source code without changing its functionality. This tool performs several specific operations:

1. Whitespace Removal

Browsers do not require spaces, tabs, or newlines to understand CSS (except in specific cases like selectors or values). The tool collapses `margin: 10px 20px;` to `margin:10px 20px;` and removes all line breaks.

2. Comment Stripping

Comments (`/* ... */`) are for developers, not browsers. This tool strips them out completely to save bytes. If you need to keep specific license comments, uncheck the "Remove Comments" option.

3. Syntax Optimization

The tool performs safe syntax optimizations, such as removing the final semicolon in a block. For example, `.box { color: red; }` becomes `.box{color:red}`. The final semicolon is optional in CSS, and removing it saves one byte per selector.

4. Safety First

This tool uses a tokenization approach. Before minifying, it identifies and "locks" sensitive strings (like `content: "keep spaces"`) and URL paths. This ensures that your minification process never breaks your site's layout or content.