Tidy Online is a Web-enabled version of Tidy, a utility originally by Dave Raggett and now developed at SourceForge, to clean up and fix errors in HTML pages. This offers you the opportunity to upload your HTML, and will print out a tidied version.
Dirty Markup is a web-based HTML Tidy interface. You can use it to harness the power of Tidy without ever leaving your web browser.
Nice (jquery) interface
Share, advance search and tidy up always updated information, documents and contacts, everywhere they are, from any time, in any format, whatever they contain and with all the people they want to.
Page Valet 4 offers the most comprehensive and accurate markup validation service anywhere on the net. It merges our previous native XML Validator into the Page Valet service.