CSS Beautifier / Formatter
Format and beautify minified or messy CSS into clean, readable code with proper indentation.
When You Need Readable CSS
Minified CSS is great for production but impossible to work with. A single line containing hundreds of rules, no indentation, no comments — it's unreadable. A CSS beautifier reverses this, adding proper structure so you can see selectors, properties, and nesting at a glance.
You'll reach for a beautifier when inspecting third-party stylesheets, debugging production CSS from DevTools, reviewing auto-generated styles, or cleaning up codebases with inconsistent formatting. Everything runs in your browser.
Before and After
Minified (1 line)
.header{display:flex;align-items:center;padding:1rem 2rem;background:#1a1a2e;color:#fff}.header h1{font-size:1.5rem;margin:0}Beautified (readable)
.header {
display: flex;
align-items: center;
padding: 1rem 2rem;
background: #1a1a2e;
color: #fff;
}
.header h1 {
font-size: 1.5rem;
margin: 0;
}Same CSS, same rendering. The beautified version just lets you actually read and edit it.
Beautifier vs Formatter vs Linter
| Tool | What It Does | Changes Behaviour? | When to Use |
|---|---|---|---|
| Beautifier | Adds whitespace, indentation, line breaks | No — cosmetic only | Quick one-off formatting |
| Formatter (Prettier) | Enforces consistent style rules | No — cosmetic only | Project-wide consistency |
| Linter (Stylelint) | Catches errors and bad patterns | May suggest changes | Code quality enforcement |
CSS Organisation Best Practices
Property ordering
Most teams order by type: layout (display, position, flex), box model (margin, padding, border), typography (font, color), then visual (background, shadow). Consistency matters more than the specific order.
Selector specificity
Formatted CSS makes specificity visible. If you see three nested selectors deep, that's a code smell. BEM naming (.block__element--modifier) keeps specificity low.
File structure
Organise: reset first, then base styles, components, utilities, overrides. Each section separated by comments. If a file is too long to navigate, split it.
Use automated tools for projects
For ongoing work, use Prettier with CSS support for formatting on save. This online tool is for quick one-off formatting when you don't have your IDE handy.
Related Tools
How to use this tool
Choose your preferred indent style (2 spaces, 4 spaces, or tabs)
Paste minified or messy CSS into the input area
Click Beautify CSS and copy the formatted result
Common uses
- Reformatting minified CSS for debugging
- Cleaning up auto-generated CSS from tools
- Making inherited CSS codebases readable
- Reviewing third-party stylesheets
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