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EPUB-Checker is a small utility designed to enable you to verify your EPUB files. In addition to validating your EPUB's, which means checking the formal structure against the official EPUB specification, you can also perform a preflight. The preflight checks for e.g. missing or incorrectly linked resources.

With the pagina EPUB-Checker one can easily validate ebooks in the EPUB format. The test mechanisms of the EPUB-Checker are based on the official open-source EPUBCheck tools (version 4.2.1).

pagina EPUB-Checker capsules these tools and offers some additional features, like:

Graphical user interface (like a "real" program)
Drag & drop to validate
Ability to validate expanded/unzipped EPUBs
Expanded folders are automatically archived to an EPUB file upon validation
The generated EPUB file will be saved if valid

Localization:
English (user interface, EPUBCheck messages)
German (user interface, EPUBCheck messages)
Spanish (user interface, EPUBCheck messages)
French (user interface, EPUBCheck messages)
Portuguese (Brazil) (user interface, EPUBCheck messages)
Japanese (user interface, EPUBCheck messages)
Russian (user interface, some EPUBCheck messages)
Chinese, Traditional (user interface, EPUBCheck messages)
Czech (user interface)
Turkish (user interface)
Dutch (EPUBCheck messages)
Danish (user interface, EPUBCheck messages)
pagina EPUB-Checker doesn't need to be installed and therefore works on portable USB devices as well as on computers with restricted rights.