What’s in an EPUB File?: The OPS Folder

The OPS folder contains the text of the book, plus any fonts, images or audio/visual materials contained within the book.

What’s in an ePUB?: The OPF File

The OPF file is located within the OPS folder. ‘OPF’ stands for Open Package Format. It’s essentially an XML file, although it has the file extension .opf instead of .xml. It […]

What’s in an ePUB?: The Root Directory

An introductory look into the first level of an ePUB file