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The W3C Markup Validation Service Markup Validation Service

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

Validate by URI

Validate a document online:

Validate by File Upload

Upload a document for validation:

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


Use Doctype:

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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