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eBook Format Inspector

Inspect an EPUB file’s package structure, manifest, spine and basic metadata without modifying the book.

How it works

Choose one EPUB file.
Inspect the package, manifest, spine and metadata.
Review the report without changing the original eBook.

Related tools

Create ZIP

Bundle selected files in a ZIP archive without uploading them.

ZIP contents and safety inspector

List ZIP entries, declared sizes and suspicious paths without extracting files.

File entropy viewer

Measure byte frequencies and Shannon entropy across a file.