Developer Tools
CSS Formatter Online
Beautify CSS with consistent indentation for debugging, maintenance and code review. Your stylesheet stays in the browser.
About CSS Formatter
CSS Formatter converts compact or unevenly spaced stylesheets into a consistent, readable layout. Clear formatting makes selectors, declarations, media queries and nested blocks easier to review. It is helpful for debugging copied snippets, generated CSS and production files, but it does not validate every browser feature or improve runtime performance by itself.
Key Features
How to Use
- Paste the stylesheet or CSS snippet into the input editor.
- Run the formatter and inspect the resulting rule structure.
- Check custom properties, modern nesting and vendor-specific syntax.
- Copy the result and test it in the target browser or application.
Practical Example
Input
.card{padding:16px;background:#fff}.card:hover{transform:translateY(-2px)}Output
.card {
padding: 16px;
background: #fff;
}
.card:hover {
transform: translateY(-2px);
}Popular Use Cases
Best Practices
- ✓ Keep a source-controlled readable stylesheet.
- ✓ Test formatted output in supported browsers.
- ✓ Use a linter for invalid properties and project conventions.
- ✓ Preserve comments that document design tokens or compatibility workarounds.
Common Mistakes
- • Assuming formatting fixes invalid selectors or values.
- • Expecting beautification to reduce file size.
- • Removing important comments without review.
- • Ignoring modern syntax that may require a build tool or prefixing step.
Privacy and Processing
CSS is formatted locally in your browser during normal use, so source styles do not need to be sent to a remote formatter.
Important limitation: The tool changes presentation, not cascade logic. It does not detect unused rules, calculate specificity conflicts or replace a production CSS build pipeline.
Frequently Asked Questions
Does CSS formatting change the cascade?
It is intended to change whitespace and indentation only, so selector order and cascade behaviour should remain the same.
Will formatted CSS load faster?
No. Use the CSS Minifier for a smaller delivery copy and measure actual transfer size.
Can it format media queries?
Yes. Media-query blocks are formatted to make nested declarations easier to inspect.
Does it validate CSS?
No. A formatter is not a complete standards validator or browser-compatibility checker.
Should I keep comments?
Keep comments that explain tokens, browser workarounds, licences or non-obvious decisions.
Is CSS uploaded?
No. Normal formatting is performed locally in the browser.