Free CSS Formatter & Minifier Online | Beautify CSS Code

Beautify or Minify Your Stylesheets

CSS controls how every website looks, and stylesheets grow quickly. Code copied from a theme, a framework or a browser’s developer tools is often minified into one unreadable line; code written in a hurry ends up with mixed indentation. This CSS formatter makes any stylesheet clean and readable, and its minifier compresses CSS for faster page loads.

How to Use the CSS Formatter

Paste your CSS into the input editor, or click Load Sample.
Pick an indentation size (2, 3 or 4 spaces).
Click Format / Beautify for readable code, or Minify / Compress for production.
Copy the output and paste it into your project.

Before and After

Minified:

.btn{display:inline-block;padding:12px 24px;background:#fca311;color:#14213d;border-radius:6px}.btn:hover{background:#e5930e}@media (max-width:640px){.btn{width:100%}}

Formatted:

.btn {
  display: inline-block;
  padding: 12px 24px;
  background: #fca311;
  color: #14213d;
  border-radius: 6px;
}

.btn:hover {
  background: #e5930e;
}

@media (max-width: 640px) {
  .btn {
    width: 100%;
  }
}

Why Minify CSS?

CSS is a render-blocking resource: the browser waits for it before showing the page. Smaller CSS means a faster first paint, which improves user experience and Core Web Vitals scores that Google uses as a ranking signal. Minification is one of several easy wins, along with:

Enabling gzip or Brotli compression on your server.
Removing unused CSS (tools like PurgeCSS or Tailwind’s built-in purging help).
Caching stylesheets with long expiry headers.

Tips for Maintainable CSS

Use CSS variables for brand colours and spacing: --brand: #fca311; then color: var(--brand);.
Keep selectors short and specific. Deeply nested selectors are slower to read and harder to override.
Group related rules and add short comments for sections like header, buttons and forms.
Be consistent with naming (for example, BEM: .card__title--large).
Design mobile-first: write base styles for small screens, then add min-width media queries.

Common CSS Syntax Errors

Mistake	Example	Fix
Missing semicolon	`color: red background: blue`	`color: red; background: blue;`
Missing unit	`padding: 10`	`padding: 10px`
Unclosed brace	`.box { color: red;`	`.box { color: red; }`
Wrong colon	`color = red;`	`color: red;`

Formatting your CSS makes these errors easier to spot, because a missing brace throws off the indentation of everything after it.

Related Tools

HTML Formatter — tidy your markup.
JavaScript Formatter — beautify or minify scripts.
RGB to HEX Converter — get colour codes for your styles.

Frequently Asked Questions

It puts each selector, property and closing brace on its own line with consistent indentation and spacing, making stylesheets easy to read and edit.

It removes comments, line breaks, indentation and unnecessary spaces, and often the last semicolon in each rule. The styles behave exactly the same but the file is smaller.

Typically 15–30% of the file size before server compression, depending on how many comments and how much whitespace the original contains. With gzip or Brotli enabled the difference is smaller but still worthwhile for large stylesheets.

Yes. Paste the minified CSS and click Format to make it readable. Comments removed during minification cannot be restored, but the rules and properties will be laid out clearly.

Yes. Media queries, nested at-rules, CSS variables (custom properties) and modern functions are formatted like any other block.

Simple SCSS and LESS usually format correctly because their syntax is close to CSS, but features like mixins and deep nesting may not indent perfectly. For those, use your preprocessor's own formatter.