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.


The conversion struggle

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 […]

Zipping and Unzipping an ePUB

Explanation of how to unzip and re-zip an ePUB file on a Mac or PC

What’s in an ePUB?: The Root Directory

An introductory look into the first level of an ePUB file

Responsive Design for Ebooks

Responsive design is a flexible way to display websites and other HTML documents using specific CSS practices.

Converting EPUB2 files to EPUB3, presented by Joshua Tallent

In this video, Joshua Tallent, Firebrand’s Chief eBook Architect, will walk you through the process for upgrading your EPUB2 files into the EPUB3 format.

Open Source Ebook Production, presented by David Ward

If EPUB is an open standard, why aren’t more people paying attention to the huge number of open source tools available to ebook developers?

Fixed Layout Vs. Reflowable EPUBs

When deciding which format is best for your book, here are some questions that should help you make your decision.

Font Embedding in Ebooks

Font expert Champagne Choquer discusses general font guidelines and reveals best practices so that you can take your ebook typography to the next level.