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Our CSS Validator tool helps you check the syntax of your CSS code instantly. It detects common errors such as mismatched braces, missing semicolons, invalid selectors, and malformed properties. All processing happens in your browser — your code never leaves your device.
This tool validates CSS syntax using a comprehensive rule engine that checks for common syntax errors, mismatched braces, invalid selectors, and malformed properties. While it catches most common mistakes, it does not perform full W3C CSS specification compliance checking like the official W3C validator.
Absolutely. All validation happens entirely in your browser. No CSS code is sent to any server.
Yes! Simply copy and paste the contents of your CSS file into the input area, then click Validate. You can also paste multiple CSS files at once.