Developer Tools
CSS Minifier
Remove comments, collapse whitespace, and strip unnecessary characters from your CSS.
Original size471 B
Minified size383 B
Size reduction88 B19%
Developer Tools
Remove comments, collapse whitespace, and strip unnecessary characters from your CSS.
A CSS minifier removes unnecessary whitespace, comments, and redundant characters from your stylesheets without changing their behaviour. It shrinks file size by 20–50%, speeds up page load times, and is essential for production websites.
CSS minification is the process of compressing cascading stylesheets by eliminating all non-essential data—spaces, tabs, newlines, and comments—that the browser does not need to render styles. The result is semantically identical CSS that takes up far less bandwidth and loads faster.
The minifier parses your CSS and strips out whitespace between selectors, properties, and values, removes all comment blocks, collapses multiple spaces and newlines into none, and can optionally shorten colour values (e.g., #ffffff → #fff). It preserves all functional rules, pseudo-classes, media queries, and keyframe animations. The compressed output is valid CSS that performs identically to the original.
| Input | Result | Notes |
|---|---|---|
| body { color: #ffffff; margin: 0px; /* Reset default styles */ padding: 0px; } | body{color:#fff;margin:0;padding:0} | Whitespace and comments removed; #ffffff shortened to #fff; px on zero values dropped. |
| .button { background-color: rgb(255, 0, 0); padding: 10px 10px; border: 1px solid black; /* Outline */ } | .button{background-color:red;padding:10px;border:1px solid #000} | rgb(255, 0, 0) converted to named colour; duplicate padding values collapsed; comment stripped. |
| /* Header styles */ h1 { font-size: 28px; } h2 { font-size: 24px; } | h1{font-size:28px}h2{font-size:24px} | Block comment removed; newlines and indentation eliminated; file size reduced by ~60%. |
No. Minified CSS is functionally identical to the original—only whitespace and comments are removed. Your styles will render exactly the same.
Typically 20–50% depending on how much whitespace, comments, and redundant properties your original CSS contains. Highly commented or verbose stylesheets see bigger gains.
Minify only in production. In development, keep CSS unminified so it remains readable for debugging and team collaboration.
Not reliably—minification is a one-way process. Always keep an unminified backup in version control.
Minify after compilation. Compile your Sass/Less to CSS first, then minify the output for best results.
Yes. Minification reduces the file size *before* compression, so gzip has less data to compress. Together they deliver the best reduction.