Validators and Lints - Musharof Chy
Validome
Validation services for HTML, XHTML, WML, XML, DTD, Schema, RSS and Atom feeds and even Google site...
W3C Markup Validation Service
World Wide Web Consortium validator, maintained at W3C by W3C staff and collaborators. Checks the m...
Web Page Backward Compatibility Viewer
Uncheck tags to be unsupported and see how the page looks.
Web Page Purifier
Checks how a webpage looks with different HTML versions.
Dr. Watson
Checks HTML code, links, spelling, download time and link popularity.
WDG HTML Validator - HTML Help
Produces easy to read HTML error messages. Can validate one page or a batch of pages at one time.
HTML Tidy Online
Cleans up coding errors, especially useful for deeply nested ones.
Validation Bookmarklets
JavaScript bookmarklets which check alt text, broken images, small screen readability, and HTML val...
Microsoft Word 2000 HTML Mess Cleaner
Removes clutter from Microsoft Word 2000-generated HTML. ASP source code available for purchase.
Web Validators
Links to validators for XHTML, HTML, CSS, RSS, XML, and RDF documents.
HTML/XML Validator
Validates and repairs HTML, XHTML, and XML. Also includes accessibility checking.