Will minified CSS still work exactly the same?

Yes. CSS minification only removes whitespace and comments — it doesn't change any CSS rules, selectors, or values. The browser renders minified CSS identically to the original.

How much can CSS minification reduce file size?

Typically 20–50% reduction depending on how much whitespace and comments your original CSS contains. CSS with many detailed comments can see even greater reductions.

Should I minify CSS manually or use a build tool?

For production workflows, build tools like webpack, Vite, or Parcel should minify CSS automatically. This tool is ideal for quick manual minification, one-off files, or when build tools aren't available.

Can I minify CSS with source maps?

This tool produces a minified CSS string without source maps. For development with debugging support, use build tools that generate source maps alongside the minified output.

Is there a risk of minification breaking my CSS?

Minification tools are well-tested and rarely break valid CSS. However, some edge cases (certain vendor prefixes, calc() expressions) may occasionally cause issues. Always test minified CSS before deploying.

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CSS Minifier

Minify CSS by removing comments, whitespace, and redundant characters to reduce file size.

CSS Input

What is CSS Minifier?

The CSS Minifier compresses CSS code by removing all unnecessary whitespace, comments, and redundant code — producing a functionally identical but significantly smaller CSS file. Minified CSS loads faster, reducing page weight and improving Core Web Vitals scores.

CSS files are often written with generous spacing, comments, and indentation for readability. These additions are valuable during development but add unnecessary bytes in production. Minification typically reduces CSS file size by 20–50%, directly improving page load time.

Why Use CSS Minifier?

CSS file size directly affects page load speed, which is a Core Web Vitals factor and Google ranking signal. Minifying CSS is a standard production optimisation that requires zero effort to apply and consistently reduces file size by 20–50%.

Key Features of CSS Minifier

✓Removes whitespace, newlines, and indentation
✓Strips CSS comments
✓Removes redundant semicolons
✓Preserves CSS functionality completely
✓Shows original vs minified size and savings percentage

How to Use CSS Minifier

1
Paste your CSS
Enter your CSS code into the minifier input area.
2
Minify
Click 'Minify CSS' to compress the code.
3
Review the output
See the minified CSS and the size reduction achieved.
4
Copy minified CSS
Copy the minified CSS for use in your production stylesheet.
5
Deploy to production
Replace your development CSS file with the minified version in your production build.