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Review your EPUB’s technical conformance

Keep an EPUB with its book record and review technical conformance findings with clear locations and practical guidance. Your source file stays intact.

Open EPUB Validate

A clearer picture of EPUB conformance.

  • Keep the source intact
  • See what needs attention
  • Get context for the findings

Keep the source intact

Validation works from an immutable revision and never rewrites your original EPUB.

See what needs attention

Review errors and warnings with EPUBCheck rule IDs and locations inside the book.

Get context for the findings

Use versioned guidance to understand a rule and plan the next correction.

Know what validation covers

EPUBCheck tests packaging and EPUB specification rules. Accessibility and meaning-dependent checks also require human review.

Meet the rest of your toolbox.

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Organise your book metadata, ISBNs, files and exports in Book Bubba.

Start your free workspace Free starter credits. Unlimited tools with a monthly plan.

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