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RSS Validators
Use these RSS tools to create your RSS feeds and then validate them with the validators.
Validate Your RSS or Atom Feed
Use this form to validate your RSS or Atom feed against the W3C specification.
Experimental RSS 1.0 Validator
Use this online validator to validate your RSS 1.0 feeds.
RSS 0.9x Validator
An online validator for UserLand's 0.9x RSS.
W3C RDF Validation Service
You can either paste in your RDF file or type in a URI.