W3C HTML Validation Service
World Wide Web Consortium validator.
Web Mechanic
Validator and lint eliminates redundant or conflicting tags and compresses image files. Pay service.
Web Page Purifier
Check how a webpage looks with different HTML versions.
Web Page Backward Compatibility Viewer
Uncheck tags to be unsupported and see how the page looks.
HTML Code Cleaner
Lint reduces size of HTML files by removing unnecessary tags and spaces.
Search Engine World Validator
HTML and XHTML validator. Validates by URL and file upload.
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.
Doctor HTML
Lint checks spelling, images, and links.
Alpine HTML Doctor
Identifies common HTML code errors, corrects the code, and generates a repair file for cut and paste back into a document.
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