HTML Tidy is supported by many operating systems. Including Windows, DOS, Mac, various forms of Unix, Amiga, Atari and others. It is also built into many programs like Allaire Homesite, Evrsoft 1stpage 2000 (or whatever they call it now) and others.

Check out the HTML Tidy homepage at http://www.w3.org/People/Raggett/tidy/ or download the windows version here.

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Wayne Luke - Sitepoint Moderator/Internet Media Developer
Digital Magician Studios - Making Magic with Web Applications
wluke@digitalmagician.com