Ensure your ebook is ready for distribution on Apple Books, Amazon Kindle, Kobo, and Google Play. This tool validates an EPUB ebook against official W3C EPUB standards and outputs a structured validation report.
How to validate an EPUB
- Upload an EPUB ebook file (
.epub) up to 80 MB. - Press Convert file.
- Download or inspect the structured JSON report detailing validation results and metadata.
What you get
A JSON validation report containing:
- Validation summary and overall status (valid or invalid)
- Itemized lists of errors, warnings, and formatting issues with line and column numbers
- EPUB version and metadata checks (title, author, identifier, language)
- Manifest item details and spine structure validation
When this helps
- Before submitting an ebook to self-publishing platforms or retail stores
- When debugging rendering or formatting issues in e-reader apps
- To verify automated ebook generation pipelines without local software installation