Site:
validator.w3.org

The W3C Markup Validation Service

W3C's easy-to-use HTML validation service, based on an SGML parser.
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(based on 30 ratings)
Ranked:
#1 in Computer General, #1 in Validation, #1 in W3C, #1 in Web Site Tools, #1 in XHTML, #2 in HTML CSS, #2 in Web Programming, #3 in WWW, #5 in Web Standards, #5 in Web Tools
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  Reviews (8)  
 
Date | Rating 
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By Harry69.  September 06, 2011 at 10:51PM (PST)
Perfect tool. Even better with a Firefox-Extension like: Html Validator (Marc Gueury), Total Validator, Validator (Teun van Eijsden), Page validator (Michael Langley) etc.
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By hasan.bookmarks.  April 04, 2011 at 05:35PM (PST)
http://validator.w3.org/
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By TeAmigo.  September 02, 2010 at 02:34PM (PST)
Great Service!
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By deacon666.  July 22, 2010 at 03:09AM (PST)
The Best for The BESTS
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By crow666.  May 26, 2010 at 05:12PM (PST)
is the best validator
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By alquery.  May 14, 2010 at 12:59PM (PST)
Best (x)html validator ever; I use it all the time.
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By hdzsroi.  December 21, 2009 at 03:31PM (PST)
you are looser if you haven't used this service yet...
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By mholakovsky.  December 07, 2009 at 12:41AM (PST)
perfect to validate my html code