EPUB Health Check
Inspect EPUB packaging, package metadata, manifest, spine, navigation, internal links, media declarations, and archive safety; optionally repair only the standard mimetype ZIP packaging.
Inspect an EPUB container against the finalized EPUB 3.3 packaging model: ZIP safety, root mimetype packaging, META-INF/container.xml, package metadata, manifest resources, spine order, the EPUB navigation document, XHTML/SVG/CSS references, remote-resource declarations, and undeclared archive files.
How to use this tool
Upload an accepted source file
Choose a file in one of the supported input formats. NetroDoc validates it before processing.
Choose the compatible action
Select this tool from the actions shown for your file, then start processing.
Download and review the result
Open the output and check the information, page order, readability, and file type before using it elsewhere.
What this tool does
Inspect EPUB packaging, package metadata, manifest, spine, navigation, internal links, media declarations, and archive safety; optionally repair only the standard mimetype ZIP packaging.
EPUB 3.4 is still a W3C Candidate Recommendation, so this tool uses EPUB 3.3 as the normative basis and treats non-3.0 package versions as legacy/future context rather than silently applying draft rules. The optional repair only corrects the deterministic mimetype ZIP entry and never edits package metadata, navigation, book content, or links.
When this output is useful
Specific workflow
Check an EPUB before distribution or after an export when a reader, store, or validation workflow reports packaging, navigation, missing-resource, or metadata problems.
Review before relying on the result
EPUB 3.4 is still a W3C Candidate Recommendation, so this tool uses EPUB 3.3 as the normative basis and treats non-3.0 package versions as legacy/future context rather than silently applying draft rules. The optional repair only corrects the deterministic mimetype ZIP entry and never edits package metadata, navigation, book content, or links.
Temporary processing and review
NetroDoc processes this request in temporary working storage and returns a new download. The output can retain sensitive information from the source, so inspect and handle it with the same care as the original.
Privacy →Frequently asked questions
What should I check after using this tool?
EPUB 3.4 is still a W3C Candidate Recommendation, so this tool uses EPUB 3.3 as the normative basis and treats non-3.0 package versions as legacy/future context rather than silently applying draft rules. The optional repair only corrects the deterministic mimetype ZIP entry and never edits package metadata, navigation, book content, or links.
When is this output useful?
Check an EPUB before distribution or after an export when a reader, store, or validation workflow reports packaging, navigation, missing-resource, or metadata problems.