Free ePUB Validation

ePub Validator

Upload a DRM-free ePub document to validate with epubcheck 3.0b5-pre. Documents will not be permanently stored in the system. We are not responsible for any confidential documents. Larger file sizes take longer to validate, so please be patient in seeing the results.



Make sure unmanifested files in your ePub book meet iBookstore requirements

Visit Unmanifested file Checking Tool for iBooks


Why validate EPUB format ebooks?

Apple’s iPad only accepts ePub format ebooks. Those ebooks need to pass the strict ePub validation requirements.
EPUB is a globally accepted, free, and open ebook. The EPUB ebook format was purposely discovered to be a single format that publishers and conversion houses can use in-home, as well as for distribution and sale. EPUB is the file extension of an XML format for reflowable digital books and publications.

Many times during an ePub conversion, the standards for ePub reflowable digital books are not maintained and it causes an error.  To identify any such errors, the ePub validation tool was discovered. This tool identifies errors for the ePub book developer to eliminate, then creates the ePub format book to meet all standards. The ePub validation tool checks OCF container structure, OPF, and OPS mark-up.

Why let convert your books to EPUB format? has a highly skilled and knowledgeable team of developers who will make sure your ePub ebooks pass Apple’s strict validation requirements.

Even though your ePub format ebook may pass the standard ePub 1.2 validation, Apple may reject to accept your epub format file due to unmanifested files which are not detectable by normal ePub validation tools. (Detect unmanifested epub file here) Our developers will eliminate any such errors and will pass your Apple ePub ebook requirement.

If you are an author, publisher, or copyright owner looking for paid, professional assistance, then we are your answer invalidating, formatting, or meeting Apple iBookstore standards for an ePub file. Contact us or call (515) 865-4591 for a quote.