Markup Validation Service

Check the markup (HTML, XHTML, …) of Web documents ●Validate by URI ●Validate by File Upload ●Validate by Direct Input Validate by URI

Address:

More Options

Character Encoding		Only if missing
Document Type		Only if missing
List Messages Sequentially Group Error Messages by Type
Show Source	Clean up Markup with HTML-Tidy
Show Outline	Validate error pages	Verbose Output

Validate by File Upload

File:

More Options

Character Encoding		Only if missing
Document Type		Only if missing
List Messages Sequentially Group Error Messages by Type
Show Source	Clean up Markup with HTML-Tidy
Show Outline	Validate error pages	Verbose Output

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

More Options

Validate Full Document
Use Doctype:		Only if Doctype is missing
Validate HTML fragment
Use Doctype:	HTML 4.01 XHTML 1.0
List Messages Sequentially Group Error Messages by Type
Show Source	Clean up Markup with HTML-Tidy
Show Outline	Validate error pages	Verbose Output

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 feedsorCSS 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. ●Home | ●About... | ●News | ●Docs | ●Help & FAQ | ●Feedback | ●Contribute |