Quote:
Originally Posted by Fbone
Is there an easy way to determine if a book is epub2 or epub3?
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Probably need to pop it open and look at the OPF file. There'll be a version attribute in the package tag. calibre's editor would let you see it pretty easily, if you use calibre. You could also use the online IDPF epub validator (validator.idpf.org). It will detect the version.
Or if you mean looking at Kobo's catalog ... if the download options don't specifically say EPUB2, it's probably EPUB3.