CSS Validator
Check CSS for syntax errors with line and column details. Parse stylesheets locally before you deploy.
Validate CSS before you ship
A missing semicolon or brace can break an entire stylesheet. This validator parses CSS locally and highlights syntax problems with line and column hints plus simple stats about rules and declarations.
Pair it with the CSS Beautifier to reformat valid sheets, or the CSS Minifier when you need a production build.
Frequently Asked Questions
Does this check browser support?
No. It validates syntax only. Vendor prefixes and experimental properties still parse if they follow CSS grammar.
Can I upload a file?
Yes. Use the file control on the CSS input area to load a .css file from your computer. Parsing happens in the browser; nothing is uploaded to a server.
Why do stats show zero rules for an empty file?
Blank input skips validation. Paste or load CSS to see rule and declaration counts.
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