In Partnership with AOL
See also:
  • W3C Markup Validation Service - World Wide Web Consortium validator, maintained at W3C by W3C staff and collaborators. Checks the markup validity of Web documents in HTML, XHTML, SMIL and MathML.
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  • Cleanup HTML - On-line tool based on Tidy to clean up HTML code.
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  • Dirty Markup - Combines the power of HTML Tidy, CSS Tidy, JS Beautify, and the Ace editor to effortlessly clean up code.
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  • Dr. Watson - Checks HTML code, links, spelling, download time and link popularity.
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  • HTML and XHTML Syntax Checker - Locates webpage coding errors, lists error number and page source.
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  • HTML Tidy Online - Cleans up coding errors, especially useful for deeply nested ones.
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  • HTML/XML Validator - Validates and repairs HTML, XHTML, and XML. Also includes accessibility checking.
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  • ivalidation - Tools that will validate HTML, CSS and RSS. Also includes a link checker to find broken links.
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  • Microsoft Word 2000 HTML Mess Cleaner - Removes clutter from Microsoft Word 2000-generated HTML. ASP source code available for purchase.
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  • Multipage Validator - Validates the HTML / XHTML code of all the pages of a website.
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  • Site Validator - A multi-page validator that checks HTML and CSS. Paid service
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  • Validation Bookmarklets - JavaScript bookmarklets which check alt text, broken images, small screen readability, and HTML validity.
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  • Validator Pro - Multi-page validator checks HTML and broken links. 50 pages free, 75 with registration
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  • Validome - Validation services for HTML, XHTML, WML, XML, DTD, Schema, RSS and Atom feeds and even Google sitemaps.
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  • vldtr - Validates HTML pages, CSS files and RSS or Atom feeds against W3C standards. Lists of files can be saved and revalidated later.
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  • Walidator - Portal to several validators and URL analyzers.
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  • WDG HTML Validator - HTML Help - Produces easy to read HTML error messages. Can validate one page or a batch of pages at one time.
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  • Web Mechanic - Validator and lint eliminates redundant or conflicting tags and compresses image files. Pay service.
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  • Web Page Backward Compatibility Viewer - Uncheck tags to be unsupported and see how the page looks.
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  • Web Page Purifier - Checks how a webpage looks with different HTML versions.
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  • Web Validators - Links to validators for XHTML, HTML, CSS, RSS, XML, and RDF documents.
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Last update: July 21, 2014 at 5:15:04 UTC - edit