What does the CSS minifier remove?

It strips comments, collapses runs of whitespace, removes spaces around braces, colons, semicolons and combinators, and drops the unnecessary semicolon before each closing brace.

Does minifying CSS change how it renders?

No. Minification only removes characters that the browser ignores — comments and unneeded whitespace and punctuation. The styles render identically, just from a smaller file that loads faster.

How much smaller will my CSS get?

It varies with how much whitespace and commenting your source has. Heavily formatted, commented stylesheets often shrink 20-40%, while already-compact CSS shrinks less.

Is my CSS uploaded anywhere?

No — minification runs entirely in your browser and nothing is sent to a server.

CSS Minifier — Gera Tools

Q: Will it break url() values or string content?

No. The minifier copies the contents of quoted strings verbatim, so values inside url("...") and content properties are left exactly as written.

This tool minifies CSS to make your stylesheet smaller and faster to load, entirely in your browser. Paste your CSS and it removes everything the browser does not need — comments and redundant whitespace and punctuation — without changing how the styles render. It is handy for shrinking a stylesheet before deployment when you do not want to set up a build step.

How it works

The minifier walks through the source and applies these transformations while leaving string contents untouched:

Strips /* ... */ comments.
Collapses runs of whitespace to a single space, then removes spaces around the structural punctuation { } : ; , and combinators.
Drops the unnecessary semicolon before each closing brace.

Crucially, it copies the contents of quoted strings verbatim, so values inside url("...") and content properties are preserved exactly.

Example

This input:

/* Card */
.card {
  display: flex;
  padding: 12px;
  color: #ffffff;
}

minifies to:

.card{display:flex;padding:12px;color:#ffffff}

The comment, indentation, line breaks and the trailing semicolon are all gone, but the rule behaves identically. It all runs in your browser, so nothing is uploaded.