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Tools / Developer / CSS Minifier

Developer tool

CSS Minifier

Minify CSS instantly by removing whitespace and unnecessary characters.

Step 1

Paste input

Add your content in the input editor.

Step 2

Run tool

Process instantly with in-browser logic.

Step 3

Copy output

Export clean results to your project.

All-time runs

Live traffic

30-day success

Reliable processing

Average speed

Fast avg

⚡ Runs instantly in your browser. No files are uploaded.

Input

Output

Ready.

Learn more

Learn more about this topic:

How to Minify CSS (Reduce File Size)

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About CSS Minifier

Every unnecessary byte of CSS a browser downloads before painting the first pixel delays First Contentful Paint. Minification removes whitespace, comments, and redundant characters from stylesheets without changing any rule, selector, or property value. This CSS minifier processes your stylesheet in a single pass and produces a compact .css file ready to serve from a CDN or inline. It is useful for static sites without a build pipeline, third-party CSS that needs to be inlined, legacy project files not passing thro...

Runs locally in your browser. The text you enter is not uploaded to CodeStorms.

→ Minify a stylesheet for a static HTML site that does not pass through a build tool. → Compress a third-party CSS component you are inlining to avoid a separate network request. → Reduce a legacy project's CSS files before a performance review or audit. → Prepare email HTML inline CSS to stay under size limits that affect deliverability.

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📦 Supported formats 1 file types

CSS

❓ Frequently asked questions 3 answers

Typically 20–50% smaller depending on how much whitespace and how many comments the original contains.

No. The minifier only removes insignificant whitespace and comments. Selectors and rules are preserved.

Build tools like Vite or webpack handle minification automatically. Use this tool for quick one-off jobs or files you can't run through a build pipeline.