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CSS Formatter, Beautifier & Minifier

Format, beautify and minify CSS instantly in your browser. Clean up messy stylesheets or compress them to ship — free, private, and your CSS never leaves your device.

No Tracking Runs in Browser Free
Indent
Formatted CSS

🔒 100% in-browser — your CSS never leaves your device.

Reviewed for render-safe formatting and lossless minification — Go Tools Engineering Team · Jun 5, 2026

What is CSS Formatting?

CSS formatting (also called beautifying or pretty-printing) rewrites a stylesheet with consistent indentation, line breaks and spacing so its structure is easy to read and review. The styles render identically before and after — only whitespace changes. Minifying does the reverse: it removes comments and collapses the CSS to the smallest possible size so pages load faster. This tool does both, entirely in your browser.

Key Features

Format and minify

Beautify messy CSS for readability or compress it to the smallest shippable size — in one tool.

Byte-savings readout

See exactly how many bytes minification saved, so you know the payload impact.

100% private

All processing happens in your browser. Your CSS is never sent to a server.

Style controls

Choose 2-space, 4-space or tab indentation to match your team's conventions.

Examples

Minified rule set

body{margin:0;padding:0;font-family:system-ui}.card{display:flex;gap:1rem;padding:16px;border-radius:12px;background:#fff}.card:hover{box-shadow:0 4px 12px rgba(0,0,0,.1)}

Expand a single-line stylesheet into readable, indented rules.

Media query

@media(max-width:640px){.nav{flex-direction:column}.nav a{padding:8px 0}}

Indent nested at-rules so breakpoints are easy to scan.

Custom properties

:root{--primary:#6366f1;--gap:8px}.btn{color:var(--primary);margin:var(--gap)}

Format CSS variables and var() usage cleanly.

Keyframes

@keyframes spin{from{transform:rotate(0)}to{transform:rotate(360deg)}}

Lay out animation keyframes line by line.

Common Use Cases

Clean up inherited CSS
Beautify a minified or inconsistent stylesheet so you can actually read and edit it.
Code review
Format CSS before a pull request so reviewers see consistent, diffable styles.
Ship smaller
Minify production CSS to cut bytes and speed up page loads.
Learn from examples
Paste a snippet copied from a site and format it to understand how it's structured.

Technical Details

Beautified with js-beautify
Uses the same battle-tested engine behind popular online beautifiers for predictable, configurable output.
Minified with CSSO
Compresses safely — merging whitespace and removing comments without changing how styles render.
Browser-based
Runs entirely client-side; no CSS ever leaves your device or hits a server.

Best Practices

Format source, minify for production
Keep readable CSS in your repo and minify only as a build/deploy step.
Pick one indentation style
Agree on 2 spaces, 4 spaces or tabs across the team for clean diffs.
Minify last
Run minification after all edits — minified CSS is hard to maintain by hand.

Frequently Asked Questions

How do I format CSS online?
Paste your CSS into the input box and click Format. The tool reindents the stylesheet with consistent line breaks and spacing, then lets you copy it. Everything runs locally in your browser — nothing is uploaded.
How do I minify CSS?
Paste your CSS and click Minify. The tool removes comments and collapses whitespace to produce the smallest equivalent stylesheet, and shows how many bytes you saved. The minified CSS renders exactly like the original.
What is the difference between formatting and minifying CSS?
Formatting (beautifying) adds indentation and line breaks to make CSS readable. Minifying does the opposite: it strips comments and whitespace to shrink the file for faster loading. Both produce styles that render identically to the original.
Does formatting change how my styles look?
No. Formatting and minifying only change whitespace and comments — never selectors, properties or values. The page renders exactly the same before and after.
Is my CSS safe with this tool?
Yes. All formatting and minifying happen locally in your browser using JavaScript — your CSS is never sent to any server, logged, or stored. That makes it safe for proprietary or unreleased styles, unlike server-side formatters that receive a copy of everything you paste.
Can it format SCSS or Less?
It formats and minifies standard CSS. Plain SCSS/Less that is also valid CSS will usually format fine, but pre-processor-only syntax (nesting, mixins, variables with $ or @) is best handled by your pre-processor's own formatter.
What indentation should I use for CSS?
Two spaces is the most common default and keeps diffs compact; four spaces can improve readability for deeply nested rules; tabs let each developer choose their width. Pick one and apply it consistently — this tool supports all three.

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