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The most popular language/framework on the Web

The W3C Validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc. Edit

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  • Cris fanatic
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    If I have to learn HTML, I wanna do it well. Thanks w3.org. :)

  • Radek Holý fanatic
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    Very useful....
    For Czech users I advice http://validator.w3.cz/. I think, it's better than original.

  • MICHhimself fanatic

    Great tool to work the bugs out of your code, by the guys who developed the standards. Therefore, you can't go wrong with this one ;)

  • ohmanger fanatic
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    great for web development, and easy to use. in Opera just smash alt+ctrl+shift+u then you can validate the current page. handy indeed.

    Now all we need is for the majority of people to stop using IE6.... a 100% validating website doesn't necessarily mean it will show correctly across all browsers.

  • Zopokx fanatic
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    La herramienta perfecta para validar todos los estándares web!

  • Alenônimo expert
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    Documentation is the best source. But they could tweak a little their site, huh?

  • samiism fanatic
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    Handy site for a web designer like me. It's got everything I need to know about HTML, XHTML, CSS, etc.

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Website: validator.w3.org
Developer: World Wide Web Consortium
License: Free
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Usage: 1 week, 6 hours, 14 minutes and 34 seconds
Usage since: 14 August 2009
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Rank: #359