EPUB Structure Inspector
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Known limits
Not a full EPUBCheck conformance test or reader-device compatibility guarantee.
Input and processing
Check whether an EPUB has basic required ZIP components and ebook metadata.
How to use
Select an EPUB file and inspect its package structure and required entries.
Inspection
Not a full EPUBCheck conformance test or reader-device compatibility guarantee.
Who should use this tool?
Check whether an EPUB has basic required ZIP components and ebook metadata.
Before you begin
Select an EPUB file and inspect its package structure and required entries.
Step-by-step instructions
- Prepare the supported inputs described above. Keep original files as a backup.
- Use the tool controls to process the information. Review any on-screen warnings before proceeding.
- Inspect the generated output against your input before downloading or printing.
What will you receive?
A structural preflight checklist.
Limitations and incorrect-result cases
Not a full EPUBCheck conformance test or reader-device compatibility guarantee.
Questions about your data
Are my files sent to a server?
File-processing calculations run in this browser. Hosting, fonts, analytics scripts and optional third-party libraries may still make network requests. Read our privacy policy for details.
Should I trust the output without checking?
No. Compare important results with the original and use a professional check where legally or technically required.