Paste your stylesheet and get a compact, single-space version back — comments removed and unnecessary whitespace stripped so the file downloads faster.
No — it is a basic minifier. It removes block comments, collapses whitespace and drops spaces around { } : ; , > + ~ plus the last semicolon before a closing brace. It does not rewrite colors, merge rules or shorten values.
Edge cases such as quoted strings like content:"a b" can be affected, because spaces inside quotes are not protected. Skim the result and test the stylesheet before shipping it.
No. Minifying runs 100% in your browser and nothing is uploaded — your stylesheet stays on your device.