How to validate my ePub file

You can validate your epub file online or locally by epubcheck or by ePub Maker.

Online Validation

Now there are several sites providing free validation service.

How to setup ePubCheck

If you want to validate your ePubs on your own computer, you need to install ePubcheck first. Then set it up in ePub Maker.

How to setup ePubCheck on your PC