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Revision as of 18:00, 10 March 2012 by Tantek (talk | contribs) (move Optimus to past validators until it's fixed, add Yandex microformats validator)
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<entry-title>microformats validators</entry-title>

general purpose validators

The following validators will validate multiple microformats on a page:

Bing Markup Validator

The Bing Markup Validator tests for various microformats support, including hCard 1.0, hCalendar 1.0, and others. Note: 2012-02-03 launch announcemnt: Bing Webmaster Center blog: Webmaster Tools Markup Validation Tool

Google Rich Snippets Testing Tool

The Google Rich Snippets Testing Tool can parse several microformats from a given URL and produces reports showing errors and a preview of what properties it detects. It supports a subset of properties on some microformats, however is continuously updated with more support.

microformats: hCard 1.0, hCalendar 1.0, hReview 0.4 (in progress), hRecipe 0.22, hProduct, rel author (and indirectly rel="me")

Yandex microformats validator

The Yandex microformats validator parses several microformats from a URL and shows what properties it detects and/or needs.

microformats: hCard 1.0, hRecipe 0.22, hReview 0.4 (in progress), hProduct

browser microformat readers

Main article: browsers

Mozilla Firefox

Main article: Firefox

Operator automatically detects many of the more common microformats as you browse the internet. Microformats: hCard 1.0, hCalendar 1.0, adr, rel author

Google Chrome

Main article: Chrome Extensions

Microformats for Google Chrome automatically detects most of the common microformats as you browse. Microformats: hCard 1.0, hCalendar 1.0, hReview 0.4 (in progress), hReview-aggregate 0.2, hRecipe 0.22, Geo

specific microformats validators

hCard Validator

Operator Debugger

Main article: Operator Firefox plugin

microformats: hCard 1.0, hCalendar 1.0

Operator does a good job of compliant parsing for microformats in general, and includes a debug mode that can help identify errors in the structure.


Rel-Lint provides linting and inspection of rel="tag" and XFN (by )

validator project

There has been a suggestion to host an "official" microformats validator at


  • hCard validator is open-source (BSD-licensed) and extensible enough to support other microformats (it's mostly a matter of hooking up XSLT templates that extract microformat data and find errors). The codebase is pretty clean, UI is internationalized.

Who wants to help make this happen, and what do you need?

past validators


Main article: Optimus microformats transformer and validator

Optimus microformats transformer and validator is a microformats transformer and validator that supports numerous microformats including hCard 1.0, hCalendar 1.0, hReview 0.4 (in progress), hAtom 0.1 (note: hAtom validation issues).

Get the Optimus microformats validator favelet. Blog post: validator browser button.

Optimus validator is not working for the moment

Therefore any page you will check through will return the message: "Microformats at this page have no errors. Congratulations." which is a false message. We will update this message when (and if) Optimus will work again.

Please add issues to the optimus-issues page.