The W3C Markup Validation Service (via Mowser)

Validate by URI Validate by File Upload Validate by Direct Input

Validate by URI

Validate a document online:

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

Upload a document for validation:

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

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.

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