Free RSS Validators
Use this list of free RSS validators to validate your RSS feed :
W3C: W3C is for syndicated feeds. It works with RSS 0.90, 0.91, 0.92, 0.93, 0.94, 1.0, and 2.0. Enter the address of your feed and click “validate.” Errors will be highlighted, with messages for each problem. Not sure what the message means? There’s a “help” link with more details.
Feed Validator: Feed Validator is for Atom, RSS, and KML feeds. LIke W3C, it also gives you highlighted errors with messages and information for each problem found.
RSS Validator: Enter the URL of an RSS feed for quick validation.
Podbase: For podcast feeds. Podbase will check your URL, make sure your XML is well formed, and whether it is iTunes-compatible. It will also check for things like your cover art being in iTunes compliance, correct category, correct summary, and more.
RSS Feed Validator: For RSS and Atom feeds.
Cast Feed Validator: For podcast feeds. This validates your feed, checks the main image, as well as media files, while letting you visualize your podcast RSS feed.
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