Validators and Lints Tools HTML Markup Languages

HTML Validators check HTML against the formal HTML specification published by the World Wide Web Consortium (W3C), giving an error report. HTML Lints check HTML for compatibility with different browers and screen sizes, download times, spelling, and more. If you are only going to use one, use a validator. HTML which follows the HTML specification will be compatible with the widest audience. For compatibility with disabled users, check your documents against the W3C's Web Site Accessibility Guidelines.

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• Alpine HTML Doctor - Identifies common HTML code errors, corrects the code, and generates a repair file for cut and paste back into a document.
  
• Dr. Watson - Checks HTML code, links, spelling, download time and link popularity.
  
• HTML Tidy Online - Cleans up coding errors, especially useful for deeply nested ones.
  
• HTML/XML Validator - Validates and repairs HTML, XHTML, and XML. Also includes accessibility checking.
  
• HTML Code Cleanup - Validator and hand cleanup by professionals.
  
• Web Validators - Links to validators for XHTML, HTML, CSS, RSS, XML, and RDF documents.
  
• Web Mechanic - Validator and lint eliminates redundant or conflicting tags and compresses image files. Pay service.
  
• W3C HTML Validation Service - World Wide Web Consortium validator.
  
• Web Page Backward Compatibility Viewer - Uncheck tags to be unsupported and see how the page looks.
  
• Web Page Purifier - Check how a webpage looks with different HTML versions.
  
• Total Validator - Validator for WAI, XHTML, and HTML. Also checks for broken links and spelling mistakes.
  
• HTML Tidy Download - HTML Tidy plugin. Fixes HTML and XHTML, converts HTML to XHTML.
  
• Validation Bookmarklets - Javascript bookmarklets which check alt text, broken images, small screen readability, and HTML validity.
  
• HTML and XHTML Syntax Checker - Locates webpage coding errors, lists error number and page source.
  
• Walidator - Portal to several validators and URL analyzers.
  
• Microsoft Word 2000 HTML Mess Cleaner - Removes clutter from Microsoft Word 2000-generated HTML. ASP source code available for purchase.
  
• Pure PHP XHTML Validator - PHP class for validating XHTML documents. Source code available under LGPL.
  
• Validator-Lite - Offers validator for HTML, XHTML, and DTD-based XML languages.
  
• Validome Markup Validation Service - Multilingual validator for HTML, XHTML, and XML.
  
• XHTML CSS - Helps checking and suggesting corrections to web pages markup (HTML) and style (CSS) coding.
  
  

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