RSS & Atom Feed Validator
Validates RSS 2.0 and Atom 1.0 feeds in your browser: detects feed format, checks required elements (title, link, description for RSS; id, title, updated for Atom), validates item/entry counts, flags duplicate guids, and pre-fills the W3C Feed Validation Service for an authoritative second opinion.
Input
Invalid
Format
unknown
Items
0
Errors
1
Warnings
0
Issues
- errorXML parse failure: DOMParser is not defined
What this checks
- XML is well-formed.
- Detects RSS 2.0 vs Atom 1.0.
- RSS:<channel> has title/link/description, link is a valid URL, items have title or description, guid uniqueness, RFC 822 dates.
- Atom:<feed> has id/title/updated, ISO 8601 dates, entry uniqueness, recommends
rel="self"link.
For an authoritative second opinion, also run the W3C Feed Validation Service. Some checks (relative link resolution, namespace prefixes) require a fully deployed URL.
Real usage example
Scenario
A publication wants to ensure agents and feed readers can consume new articles.
Input
Paste the RSS or Atom feed XML before submitting it to directories.
Output
Format detection, required field checks, date warnings, and duplicate ID flags.
Verify on a real URL
Run a full agent readiness scan to see how your live site responds end to end.