HTML and CSS / BROWSER UTILITY
CSS Validator
Check stylesheet syntax and property values without applying styles.
Processed locally in your browser. Your data is not uploaded.
Good to know
Parse stylesheets and check property values against CSSTree’s CSS grammar. Custom properties are accepted; unresolved variables and emerging syntax may not be fully validated. This does not prove browser compatibility or check every selector and at-rule rule. CSS is never applied to this page and URLs are never fetched.
Example: p { color: red; } passes the enabled checks; p { color: 12px; } reports an invalid value.