How to Reduce EPUB File Size

This guide explains how to reduce epub file size using a private browser-based workflow. It focuses on publication structure, metadata and final-file checks.

Preparation

Start with a copy of the content and a clear chapter structure. Set title, author, language and description. Prepare alternative text for meaningful images and verify usage rights.

Steps

1. Choose the appropriate publication type and template.
2. Import content or create chapters manually.
3. Check heading hierarchy, links and assets.
4. Run the checker and fix critical errors.
5. Export the file and test it in the target reading app.

Important limitations

EPUB rendering can vary between reading apps. A browser-generated PDF does not replace professional print preflight. The checker assists but does not certify accessibility automatically.