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 browsers 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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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.
Cleanup HTML
On-line tool based on Tidy to clean up HTML code.
Dirty Markup
Combines the power of HTML Tidy, CSS Tidy, JS Beautify, and the Ace editor to effortlessly clean up code.
Dr. Watson
Checks HTML code, links, spelling, download time and link popularity.
HTML and XHTML Syntax Checker
Locates webpage coding errors, lists error number and page source.
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.
Microsoft Word 2000 HTML Mess Cleaner
Removes clutter from Microsoft Word 2000-generated HTML. ASP source code available for purchase.
Checks any website for broken links, spelling errors, browser compatibility, accessibility, web standards validation and search engine issues.
Site Validator
A multi-page validator that checks HTML and CSS. Paid service
Validation Bookmarklets
JavaScript bookmarklets which check alt text, broken images, small screen readability, and HTML validity.
Validator Pro
Multi-page validator checks HTML and broken links. 50 pages free, 75 with registration
Validation services for HTML, XHTML, WML, XML, DTD, Schema, RSS and Atom feeds and even Google sitemaps.
Validates HTML pages, CSS files and RSS or Atom feeds against W3C standards. Lists of files can be saved and revalidated later.
Portal to several validators and URL analyzers.
WDG HTML Validator - HTML Help
Produces easy to read HTML error messages. Can validate one page or a batch of pages at one time.
Web Mechanic
Validator and lint eliminates redundant or conflicting tags and compresses image files. Pay service.
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.
Web Validators
Links to validators for XHTML, HTML, CSS, RSS, XML, and RDF documents.
Last update:
March 6, 2016 at 6:24:05 UTC
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