Validate by URI

Enter the URI of a document (HTML with CSS or CSS only) you would like validated:

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Validate by file upload

Choose the document you would like validated:

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Validate by direct input

Enter the CSS you would like validated:

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W3C Validator Suite Logo NEW - W3C offers a beta release of a new service providing you an integrated validation report on your entire web site.
Try it now to quickly identify those portions of your web site that may benefit from attention.

Note: If you want to validate your CSS style sheet embedded in an (X)HTML document, you should first check that the (X)HTML you use is valid.