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Free developer tool

CSS Unminifier

Turn compressed, hard-to-read CSS into clean, well-formatted code in seconds. Paste your minified CSS on the left and get a readable version instantly.

Working field

Paste your minified CSS to format it.

Result

Your unminified CSS appears here.

This tool is best for making minified or third-party stylesheets readable for debugging and editing.

About the CSS Unminifier Tool

Got a compressed CSS file that is impossible to read? This tool quickly turns messy, minified CSS into a clean, well-formatted version. It keeps the workflow simple: paste and format on the left, supporting content below, and the sidebar on the left for popular and related tools.

Instant formatting

Add indentation, line breaks, and spacing to minified CSS with a single click.

Easy debugging

Make third-party or legacy stylesheets readable so you can spot and fix issues fast.

Private by design

Everything runs in your browser, so your CSS never leaves your device.

No setup required

Use it free in any modern browser with no installs, sign-ups, or hidden fees.

How it works

  1. Paste your minified CSS into the input field above.
  2. Click Unminify CSS to format it with clean indentation and line breaks.
  3. Review the readable code in the output panel on the right.
  4. Click Copy Output to grab the result, or Reset to start over.

Best practices

  • Paste valid CSS so the formatter can structure it cleanly.
  • Unminify third-party stylesheets to understand them before editing.
  • Keep the original minified file for production use.
  • Review the output before pasting it into your project.
  • Re-minify your edited code before shipping it live.
  • Use the formatted version for easier debugging and reviews.

Frequently asked questions

What is a CSS Unminifier?

A CSS Unminifier turns compressed or minified CSS into a clean, readable format by adding indentation, line breaks, and proper spacing, so the code is far easier to understand and maintain.

How do I use this tool?

Paste your minified CSS into the input box and click Unminify CSS. The tool processes your input and shows the beautified result instantly in the output panel.

Can I minify my code after unminifying?

Yes. Once you have made your edits to the readable version, run it through the CSS Minifier to shrink the file size back down for production use.

Can I use this for animated stylesheets?

Absolutely. The tool can unminify any valid CSS, including complex keyframe animations. To build new animations from scratch, the CSS Animation Generator is a great companion.

Is my CSS code safe and private?

Yes. All formatting happens locally in your browser. Your CSS is never uploaded or shared, so your code stays completely private while you format it online.

Does this tool work on mobile devices?

It does. The unminifier is responsive and runs in any modern browser, so you can format CSS on desktops, laptops, tablets, and phones with ease.

For more CSS work, try the CSS Minifier tool to compress your code for production, or the CSS Animation Generator tool to add motion to your formatted styles.