Markup Validation Service

Markup Validation ServiceMarkup Validation Service.

Check the markup (HTML, XHTML, …) of Web documents.

Validate by URI Validate by File Upload Validate by Direct Input.

Note : file upload may not work with Internet Explorer on some versions of Windows XP Service Pack 2, see our information page on the W3C QA Website.

Validate by direct input.

This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc. If you wish to validate specific content such as RSS/Atom feeds or CSS stylesheets, MobileOK content, or to find broken links, there are other validators and tools available. As an alternative you can also try our non-DTD-based validator.

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This service runs the W3C Markup Validator, v 1.3+hg.

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