EPUB Processing Guide

Core Insight: EPUB is a ZIP Archive

An .epub file is simply a ZIP archive with a specific internal structure. The most reliable way to process any epub is:

1. Copy the file to the working directory
2. Rename it from .epub → .zip
3. Unzip it into a folder
4. Find and read the navigation/TOC file first (e.g. nav.xhtml, nav.html, toc.ncx)
5. Then read content files as needed

This approach works 100% of the time and requires no special epub libraries.

Step-by-Step Workflow

Step 1: Extract the EPUB