ePUB Validator

ePUB Validator is a handy utlity designed to enable you to check your ePub files. ePUB Validator is a GUI front-end for EpubCheck.

It can detect many types of errors in Epub. OCF container structure, OPF and OPS mark-up, and internal reference consistency are checked. You can easily validate IDPF EPUB files, without having to use the command line.