CSS Formatter/Minifier

What is CSS Formatting/Minification?

CSS Formatting (CSS Beautification) refers to adding indentation, line breaks, and other formatting to compressed CSS code to restore readability. CSS Minification refers to removing unnecessary characters from CSS code that don't affect rendering, reducing file size.

Formatting Principles

CSS formatting performs the following operations:

• Selector separation — Each selector on its own line
• Property separation — Each property on its own line with indentation
• Indentation — Supports 2 spaces, 4 spaces, or Tab indentation
• Brace alignment — { after selector, } on its own line
• Comment preservation — Optionally keep or remove comments

Minification Principles

CSS minification removes the following:

• Whitespace — Multiple consecutive spaces merged to one, or completely removed
• Line breaks — All line breaks removed, output as single line
• CSS comments — All /* comment */ removed
• Last semicolon — color:red;} → color:red}
• Empty rules — Empty selectors {} removed
• Color simplification — #ffffff → #fff
• Unit simplification — 0px → 0
• Selector merging — Properties of same selectors combined
• Property merging — Selectors with same properties combined

Compression Results

Typically, CSS files can be reduced by 20%~40% after minification. Using "Extreme Minify" mode (with selector merging, property merging, etc.) can achieve even higher compression rates.

Common Use Cases

• Production deployment — Minify CSS before deployment to improve page load speed
• Debugging & maintenance — Format minified CSS for easier reading and modification
• Bandwidth savings — Reduce server traffic and CDN costs
• SEO optimization — Page load speed is a Google ranking factor
• Code review — Formatted code is easier for team collaboration and review

Preset Modes

• Format — Only format, add indentation and line breaks, no minification
• Normal Minify — Remove comments and whitespace, keep line breaks
• Full Minify — Remove comments, whitespace, line breaks, single line output
• Extreme Minify — Enable all compression options including selector merging, property merging, value simplification, etc. for smallest file size

Frequently Asked Questions (FAQ)