EPUB Health Check
Inspect one EPUB for container, package, navigation, link, and media problems before distribution. The tool reports problems without rewriting book content.
EPUB health summary
OCF mimetype packaging
Primary package metadata
Package document inventory
| Package path | Package version | Title | Language | Manifest items | Spine items | Nav documents | TOC nav |
|---|
Issues
| Severity | Code | Package | Resource | Problem |
|---|
Spine preview
| # | ID | Resource | Media type | Linear |
|---|
Repair EPUB packaging
This explicit repair only rebuilds the root mimetype entry so it contains application/epub+zip, is first in the ZIP archive, and is stored without compression. Other archive member content is copied without semantic edits.
Metadata, OPF manifest/spine, navigation documents, XHTML, CSS, images, links, identifiers, language, and publication text are not generated or changed. Structural errors remain for you to fix at their source.
Repair result
Validation basis
Normative checks are based on the finalized W3C EPUB 3.3 Recommendation. EPUB 3.4 is still a Candidate Recommendation, so draft-only requirements are not imposed.
This is a focused structural health check, not a replacement for the full EPUBCheck conformance test suite used by publishing workflows.
The EPUB is processed temporarily in memory. Book content and filenames are not added to analytics.