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CSS Validator
This tool is designed to validate your CSS source code and detect any errors or issues that may need to be corrected. CSS errors—such as missing semicolons, invalid property values, unsupported declarations, or incorrectly written selectors—can prevent styles from being applied as expected.
When your CSS contains errors, your webpage may appear broken or inconsistent, with layout problems, incorrect spacing, missing colors, or unexpected styling differences across browsers and devices. Validating your CSS helps ensure that your styles follow web standards, load correctly, and render consistently for all users.
To get started, simply paste your CSS code into the field below and click “Validate Code”. The tool will analyze your stylesheet and display clear, detailed feedback, allowing you to quickly identify and fix any problems to improve the appearance and reliability of your webpage.
CSS code
Results
Stats
Your CSS is sent to our server only to be checked. It is not stored.
How to use it
The css validator is a great tool to point out any errors or warnings you may have in your css code.
- Add your codeCopy and paste your css code into the editor above, or use Open file to load a
.cssfile. Example code fills the editor with a short stylesheet that has a few common mistakes. - ValidateClick Validate code, or press Ctrl+Enter, and the validator will then advise if there are any warnings or errors.
- Read the resultsEach message shows its type and the line it is on. Use the Errors, Warnings and Info buttons to show only one kind.
- Jump to the codeClick a message to jump to its line in the editor, where the line is shaded.
- Fix and check againGenerally warnings are not that critical, but any errors should be fixed to make your css code work correctly. The Stats panel under the results gives a summary of your stylesheet.
Good to know
Errors, warnings and info
Errors are problems such as unknown properties or invalid values. Warnings are things that work but are risky, and info messages are suggestions.
Checking HTML?
If you need to check your html code for errors, please check out our HTML Validator.
Changed the code?
The results are for the code as it was when you clicked Validate code. After you edit, they fade until you validate again.
Frequently asked questions
What does this validator check?
It reads your stylesheet and reports problems such as misspelled properties, invalid values, missing semicolons or brackets and badly written selectors, with the line each one is on. The Stats panel adds a summary of the rules, declarations, properties, variables and at-rules in your CSS.
Is the CSS I paste kept?
Your CSS is sent to our server to be checked and the answer is sent straight back. It is not stored. The tool accepts up to 300,000 characters at a time.
Why is my CSS marked as valid but still has warnings?
Warnings do not stop a stylesheet from working, so the CSS is still counted as valid when there are only warnings. They point out things that are worth tidying up.
Why does it say I made too many checks?
To keep the tool fast for everyone, each visitor can check up to 20 times a minute. Wait a few seconds and try again.
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