CSS Formatter & Minifier
Paste CSS to auto-indent and beautify it, or minify to strip whitespace and comments. Shows exact byte savings after minification.
Click Format or Minify to see output…Frequently Asked Questions
What are the performance benefits of CSS minification?
Minifying CSS removes comments, whitespace, and unnecessary characters without changing how the styles render. This reduces file size — typically by 20–50% for real-world stylesheets — which means faster download times, lower bandwidth usage, and improved Core Web Vitals scores. Even a few hundred kilobytes saved can noticeably improve page load performance on mobile networks.
Is my CSS sent to a server?
No. All formatting and minification runs entirely in your browser using JavaScript. Your CSS — which may include proprietary design tokens, internal class naming conventions, or sensitive layout information — never leaves your machine. There are no server calls, no logging, and no tracking.
How does the CSS formatter work?
The formatter uses pattern-based string transformations to normalise your CSS: it adds a newline and indentation after each opening brace, adds a newline after each semicolon, and ensures closing braces appear on their own lines with proper spacing. The result is consistently structured CSS that is easy to read and edit. It handles standard CSS syntax including selectors, declarations, media queries, and pseudo-selectors.
When should I use the minifier vs the formatter?
Use the formatter during development and code review — it makes your CSS readable and easier to debug. Use the minifier when preparing CSS for production deployment. In modern frontend workflows, a build tool like Vite, webpack, or esbuild handles minification automatically. This tool is useful when you need to quickly minify a stylesheet without a build pipeline, or when working with inline styles, email templates, or CMS-embedded CSS.