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
Information
Did you create this app?| Website: | validator.w3.org |
| Developer: | World Wide Web Consortium |
| License: | Free |
| Rating: | Features: Interface: Performance: Price/value: Overall: |
| Usage: | 1 week, 6 hours, 14 minutes and 34 seconds |
| Usage since: | 14 August 2009 |
| Share: |








If I have to learn HTML, I wanna do it well. Thanks w3.org. :)
Very useful....
For Czech users I advice http://validator.w3.cz/. I think, it's better than original.
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 ;)
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.
La herramienta perfecta para validar todos los estándares web!
Documentation is the best source. But they could tweak a little their site, huh?
Handy site for a web designer like me. It's got everything I need to know about HTML, XHTML, CSS, etc.