Guides for accessible, well-made EPUBs
Practical, plain-language guides to EPUB validation, the EU Accessibility Act and ONIX metadata — from the team that builds the tools.
The EU Accessibility Act (EAA) for EPUB publishers
What the EAA requires of ebooks from 28 June 2025, what an accessible EPUB means in practice, and how to get there.
Read the guideHow to fix the most common epubcheck errors
A field guide to the validation failures that block your EPUB — what each error family means and the mechanical fix.
Read the guideEPUB accessibility checklist (WCAG 2.1 AA)
Eight things reviewers and validators check most, how Ace by DAISY tests them, and where a human still decides.
Read the guideONIX for Books 3 metadata: a publisher guide
How the industry-standard metadata format describes your book to every store, and how to get a clean record.
Read the guidePut these guides to work
Validate, fix and enrich your EPUBs in one place. Start free — no card required.