Css Minifier Formatter — Free Online Tool





CSS Minifier & Formatter Engine


CSS Minifier & Formatter Engine

Minify CSS stylesheets to reduce file size for Core Web Vitals or un-minify for debugging.

Input CSS 0 B

Processed CSS 0 B



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

Why CSS Minification Matters for Core Web Vitals (LCP & FCP)

Cascading Style Sheets (CSS) control the visual presentation of web pages. During development, developers use whitespace, indents, comments, and long property names to keep code readable. However, web browsers do not need whitespace or comments to render pages. Minifying CSS strips unnecessary characters, reducing file size by 20% to 50% and improving First Contentful Paint (FCP) and Largest Contentful Paint (LCP) performance scores.

How CSS Minification Works

  • Strips single-line (//) and multi-line (/* */) comments.
  • Removes line breaks, tabs, and duplicate spaces.
  • Eliminates trailing semicolons before closing curly braces.
  • Converts 0px or 0em values to plain 0.

Frequently Asked Questions

Q: Does CSS minification affect site functionality?

A: No. Minification only strips non-executable whitespace and comments. Modern browser layout engines parse minified CSS identically to unminified code.