The conformance checker for EPUB publications
EPUBCheck is a command line tool. Unzip the downloaded package, open a terminal program, and start checking your EPUB files!
Validating using EPUB version 3.3 rules.
No errors or warnings detected!
Learn more on how to get started.
EPUBCheck is open source, licensed under MIT.
EPUBCheck is a W3C project maintained by the DAISY Consortium.
EPUBCheck is translated in a varierty of languages.
You can help to contribute to the localization effort!
Looking for an app?
EPUBCheck is distributed as a command line tool or a Java library.
If you prefer using an app, see this list of third-party tools integrating EPUBCheck!