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Code & Data Tool
CSS Validator
Run lightweight CSS syntax checks for braces, comments, and declarations.
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About this tool
What is CSS Validator?
CSS Validator runs lightweight syntax checks on CSS, looking for unbalanced braces, broken comments and malformed declarations.
Useful when you need to
- Find a missing closing brace
- Check CSS pasted from several sources
- Confirm a snippet is well-formed
How to use
How to use CSS Validator
01 02 Validate
Run the check.
03 Read issues
See the reported problems.
04 Fix and retry
Correct them and validate again.
Tips
Get better results
- It checks syntax, not whether properties are supported in a given browser.
- A missing semicolon can break the next declaration.
FAQ
Frequently asked questions
Does it check browser support?
No.
Is it a full CSS validator?
No, it is a quick syntax check.
Is it private?
Yes.
More practical guides · File handling and privacy · Report an incorrect instruction