The W3C Markup Validation Service

Check the markup (HTML, XHTML) of Web documents

by URI
by File Upload
by direct Input

Validate by URI

Validate a document online:

Address:

Options - ( Need Help? )

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:

Options - ( Need Help? )

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

Enter the Markup (Full Document) to validate:

Options - ( Need Help? )

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 feeds or CSS stylesheets or to find broken links, there are other validators and tools available.

Important This is a temporary instance of the validator, used for Beta Testing purposes.
If you would like to use or link to a stable version of the validator, see validator.w3.org.

Support this tool, become a

This is the W3C Markup Validator, v0.8.0-beta1.

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