A FREE feed validator is available to make sure your syndicated feeds are valid. Syndicating your content is a great way to share your knowledge. Now you can make sure your feeds are valid too. Visit feedvalidator.org to use the FREE browser-based feed validator. This is a validator for content syndication feeds. It works with RSS 0.90, 0.91, 0.92, 0.93, 0.94, 1.0, 1.1, and 2.0. It also validates Atom feeds. Visit the Feed Validator for ATOM, RSS, KML, MRSS.
To use the feed validator, enter the address of your feed and click [validate]. If the validator finds any problems in your feed, it will provide detail for each issue and highlight its location in your feed.
About the FEED Validator
Despite its relatively simple nature, RSS is poorly implemented by many tools. This validator is an attempt to codify the specification (literally, to translate it into code) to make it easier to know when you’re producing RSS correctly, and to help you fix it when you’re not.
The validator also supports the IETF standard Atom format for syndicated feeds.
There are validators for other web technologies, such as HTML, CSS and these have all proven quite popular. As personal news syndication is becoming more widespread, we saw a need for a comprehensive but easy-to-use validator for syndicated feeds.
The validator was conceived and designed by Mark Pilgrim, who also wrote most of the test cases and designed the web front end. Much of the actual back end coding was done by Sam Ruby. The validator is open source, written in Python, and distributed under the MIT license.