Does minifying change how my page looks?

No — only comments and whitespace are removed; all selectors, properties and values remain identical.

Is my CSS uploaded anywhere?

No — minification happens entirely in your browser.

Does this rename classes or variables?

No — this minifier only removes comments and whitespace; class and custom-property names are left untouched.

How much smaller will my file be?

It depends on how much whitespace and how many comments the original had.

Can I reverse minification?

Yes — use the CSS Formatter tool to re-indent minified CSS (comments cannot be recovered, since they are removed).

Does this work on very large stylesheets?

Yes, limited only by your browser's available memory.

JSON & Code Tools

CSS Minifier

Paste formatted CSS and strip comments and extra whitespace to make it smaller for production.

Start Using This Tool

Runs in Your Browser
Instant Results
100% Private

Your Text

Learn More

What Is a CSS Minifier?

A CSS minifier strips comments and every unnecessary space, tab and line break from a stylesheet, producing a smaller file that parses to exactly the same styling rules.

Minifying CSS before deploying it to production reduces the number of bytes a browser needs to download, which can meaningfully speed up page load, especially on large stylesheets.

Who Uses This Tool?

For Business

Reduce the size of a stylesheet before deploying it to production.

For Personal Use

Shrink a CSS file for a personal website.

For Students

Compare formatted vs minified CSS for a web performance assignment.

For Offices

Prepare a compact CSS file for an internal tool with strict size limits.

Why Use This Tool

Key Features

Comment & Whitespace Removal

Strips comments and every unnecessary space and line break.

Instant Minification

Output updates immediately as you paste in CSS.

100% Private

Your data is never uploaded — minification happens entirely in your browser.

One-Click Copy

Copy or download the minified result.

The Payoff

Benefits

Faster Page Loads

Smaller CSS files download and parse faster.

Always Equivalent Styling

Minifying never changes which styles apply — only whitespace and comments are removed.

Nothing Uploaded

Safe for proprietary CSS, since nothing leaves your browser.

Step by Step

How to Use CSS Minifier

Paste Formatted CSS

Add readable CSS with comments and indentation.

Read the Minified Result

A compact, whitespace-free version appears automatically.

Copy or Download It

Use the Copy or Download button to grab the result.

Specifications

Technical Details

Detail	Value
Input	CSS stylesheets
Processing	No practical limit — handled entirely by your browser
Output	Removes comments and unnecessary whitespace only — no property renaming

You Can Verify This

Privacy & Security

What actually happens to your file when you use this tool.

100% Client-Side

This tool runs entirely inside your browser using JavaScript — nothing you type or generate is ever sent anywhere.

No Upload, Ever

There is no file upload and no server processing step — your data never leaves your device.

Works Offline

Once this page has loaded, the tool keeps working even without an internet connection.

Nothing Stored

Nothing you enter is saved on our servers — refreshing the page clears everything.

No Tracking of Your Input

We have no way to see what you type, generate or convert with this tool.

Get Better Results

Tips

Keep a Formatted Source File

Always keep the readable, commented source and minify only the deployed copy.

Combine with Gzip/Brotli on Your Server

Minification and server-side compression work well together for maximum size reduction.

Frequently Asked Questions