What does this tool do?
The CSS Minifier shrinks your stylesheets by stripping comments and unnecessary whitespace, and it also offers a Beautify mode that turns messy CSS back into readable form. It is handy for web developers who want faster page loads and for anyone who needs to reformat compressed code.
How to use it
- Adjust the values and options.
- See the result in the live preview.
- Copy the generated CSS/code into your project.
Exactly what it does
Minify mode removes /* ... */ comments, collapses repeated whitespace, strips spaces around {, }, :, ;, commas and the >, ~, + combinators, drops the last semicolon in each block, and normalizes !important. The original and resulting byte counts, plus the percentage saved, appear instantly at the top. Beautify mode does the reverse: it breaks braces, semicolons and commas onto new lines with indentation so the code becomes readable again.
When to use it
When shipping CSS to production, minifying reduces the number of bytes downloaded and therefore load time. When you want to study and understand another site's minified CSS, Beautify mode expands the single-line code. Because you can toggle modes with one click, you can compress a stylesheet, switch it back to a readable layout, and grab the result instantly with the copy button.
Frequently asked questions
Can minifying break my CSS?
No. The tool only removes semantically unnecessary characters (comments, whitespace, the trailing semicolon). Selectors, properties and values are left untouched, so the output renders exactly like the original.
Does Beautify restore minified code to its exact original?
It produces a visually readable layout but cannot bring back deleted comments. It re-adds indentation and line breaks; any comments removed during minification will not reappear.
What does the percentage saved represent?
It compares the UTF-8 byte sizes of the original and the minified output. For example, '1200 → 820 bytes (-32%)' means the file shrank by roughly a third.
Is CSS Minifier free?
Yes. CSS Minifier and all 300+ tools on MagmaNex are completely free with no signup or account required.
Is my data safe?
Yes. Everything runs locally in your browser. The data you enter is never sent to a server, stored, or shared.
Does it work on mobile?
Yes. CSS Minifier works on phones, tablets and desktops — no app download needed.
🔒 Privacy: everything runs in your browser, your data is never sent to a server.