Welcome to the EPUB 3 Support Grid

This site provides reading system support information for EPUB 3 features.

To discover more, please select the area you're most interested in:

About the BISG EPUB 3 Support Grid

The EPUB 3 Support Grid is a resource for determining what features of EPUB 3.0 render correctly on the most commonly used devices, apps, and reading systems.

Looking to validate an EPUB file? Go to validator.idpf.org.

About the Test Suite

The Test Suite is a set of EPUB 3 files designed to enable anyone to test a reading system's support of various EPUB 3 features and its support for accessibility. It does not include a set of test files for each EPUB 3 specs feature but a rigorous performance evaluation of the most commonly used essential features. The current testing process involves manual evaluation and recording of results. See the Test Suite page for more details.