Strip comments and collapse whitespace in a stylesheet to make it as small as possible to serve.
/* header */
.a {
color: red;
margin: 0;
}
.a{color:red;margin:0;}
No. /* … */ comments are removed, which is most of what makes a stylesheet smaller.
No. This tool runs entirely in your browser — nothing you type or paste is uploaded, logged or stored anywhere.
There is no fixed limit. Very large documents depend on your device’s memory, but ordinary pages and files are handled instantly.