CSS Beautifier & Formatter
Paste minified or unformatted CSS and get clean, readable code back instantly — consistent indentation, one property per line, blank lines between blocks. Useful for debugging production stylesheets, reviewing third-party code, or tidying up exported styles before committing.
What the formatter actually does
CSS doesn't care about whitespace — the browser renders the same result whether your stylesheet is one long line or 5,000 neatly indented ones. But whitespace matters enormously to the person reading and editing the code.
The beautifier applies a consistent set of formatting rules: each declaration gets its own line, each rule block is indented, and blank lines separate blocks from each other. Comments are kept exactly where they are. The output is functionally identical to the input — only the whitespace changes.
This is useful in the other direction too: if you've inherited CSS that was edited by someone who formatted it inconsistently (two spaces here, four there, some rules on one line, some split), running it through the formatter normalizes everything to a single style. That makes diffs readable and code review actually productive.
Before and after
Here's what the formatter does to a typical minified stylesheet. The rendered output of the page is identical in both cases.
.container{display:grid;grid-template-columns:1fr 1fr;gap:20px;padding:0 16px}.card{padding:20px;border-radius:16px;background:#fff;box-shadow:0 10px 20px rgba(0,0,0,.1)}.card:hover{transform:translateY(-2px);box-shadow:0 16px 32px rgba(0,0,0,.15)}@media(max-width:768px){.container{grid-template-columns:1fr}}.container {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 20px;
padding: 0 16px;
}
.card {
padding: 20px;
border-radius: 16px;
background: #fff;
box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}
.card:hover {
transform: translateY(-2px);
box-shadow: 0 16px 32px rgba(0, 0, 0, 0.15);
}
@media (max-width: 768px) {
.container {
grid-template-columns: 1fr;
}
}When you'd actually reach for this
A CSS formatter is rarely something you need every day — but when you need it, it saves a lot of time. Here are the situations where it tends to come up.
Debugging third-party styles
When a UI component library ships minified CSS, reading it in DevTools is painful. Paste the stylesheet here, format it, then trace the selector hierarchy, check specificity, and find what's overriding your styles — without squinting at a single line of concatenated rules.
Reviewing design system exports
Figma, Penpot, and similar tools generate CSS for design tokens and component styles. The output is often unindented or inconsistently formatted. Beautify it before committing to a repo so reviewers can actually read the diff.
Inheriting legacy stylesheets
Old projects frequently have CSS that was hand-edited in production, then never touched again. Before refactoring, run it through the formatter to get consistent indentation — it makes unused rules, duplicate selectors, and dead code far easier to spot.
Learning from production sites
When you're trying to understand how a layout was built on a site you don't own, copy the stylesheet from DevTools and paste it here. Readable formatting makes it much easier to reverse-engineer grid structures, breakpoints, and component patterns.
Modern CSS syntax it handles
The formatter understands all current CSS syntax, not just the basics. Here's a non-exhaustive list of what it handles correctly.
--color-primary: #8b0000;grid-template-areas: 'header header' 'sidebar main';flex: 1 1 auto; align-items: center;@media (prefers-color-scheme: dark) { ... }@keyframes fadeIn { from { opacity: 0; } }.card::before { content: ''; }:is(h1, h2, h3) { line-height: 1.2; }-webkit-backdrop-filter: blur(8px);.card { & .title { font-size: 1.2rem; } }@container sidebar (min-width: 300px) { ... }Using this with browser DevTools
Chrome and Firefox DevTools show computed styles property by property, but if you want the actual source stylesheet — especially from a production site that serves minified CSS — here's the workflow:
Open DevTools → Sources tab
In Chrome, press F12, go to Sources, and navigate to the CSS file under the site's domain. Or, in the Network tab, filter by CSS and click the file to view its content.
Copy the stylesheet content
Select all (Ctrl+A / Cmd+A) in the file viewer and copy. Even if it looks like one long line, that's fine — the formatter handles it.
Paste and format
Paste into this tool. You'll get readable, indented CSS you can search through, compare against your own styles, or use as a reference for how a specific layout was built.
Quick shortcut: In Chrome DevTools, right-click any element, choose "Inspect", then click the stylesheet link next to any CSS rule in the Styles panel. That opens the full source file. From there you can copy the entire thing and paste it here.
Formatting for development, minifying for production
These are two complementary steps in a typical CSS workflow, not competing tools.
- + Makes code readable for debugging and review
- + Consistent indentation across team members
- + Easier to spot duplicate rules and dead code
- + Required when inheriting or auditing a stylesheet
- → Reduces file size for faster page loads
- → Removes whitespace, comments, and redundancy
- → Often automated by build tools (Vite, Webpack, etc.)
- → Output is not meant to be read by humans
Frequently asked questions
What does a CSS beautifier actually do?+
It reformats CSS by adding consistent indentation, line breaks between declarations, and blank lines between rule blocks. The output is functionally identical to the input — only whitespace changes, not property values or selector logic.
Will beautifying CSS break my website?+
No. CSS ignores whitespace when rendering. Indentation and line breaks are invisible to the browser. The styled output of your page will look exactly the same before and after beautification.
Can I unminify production CSS with this tool?+
Yes. Paste any minified CSS — from a production build, a CDN-served file, or a third-party library — and the formatter expands it into readable multi-line code. This is particularly useful when debugging styles from a site you don't control.
Does it preserve CSS comments?+
Yes. Inline and block comments are kept intact during formatting. This matters when working with annotated design tokens, license headers, or section dividers in a large stylesheet.
Is my CSS sent to a server?+
No. All formatting runs in JavaScript directly in your browser. Your stylesheet is never transmitted, uploaded, or stored anywhere. This makes the tool safe to use with proprietary CSS from internal design systems.
What modern CSS features does the formatter support?+
The formatter handles all standard CSS syntax including custom properties (variables), Grid, Flexbox, media queries, @keyframes animations, pseudo-elements, :is() and :where() selectors, and vendor-prefixed properties like -webkit- and -moz-.
Continue your formatting workflow
Related tools for cleaning up front-end code:
Your CSS never leaves your browser
All formatting runs in JavaScript locally on your machine. No stylesheet is uploaded, transmitted, or logged — making this safe to use with proprietary component libraries, internal design tokens, or client work you can't share externally.