Inspect an EPUB

Features

• Reads META-INF/container.xml and the OPF to list the metadata
• Lists chapters in spine order with each title and size
• Lists the image resources and their sizes
• Breaks the total size down into text, images, fonts and other
• Parses both EPUB 2 and EPUB 3
• Optionally list every resource and sort by size
• Ships its own XML parser that refuses DOCTYPE and never resolves external entities

How to use

1. Drop the .epub file in (or click to choose)
2. Read the title, author and EPUB version
3. Check the structure in the chapter and image lists
4. Use the size breakdown to find what takes the most space

FAQ

Why does a chapter title show as a file name?

Some chapter XHTML has neither a <title> nor an <h1>/<h2>, so the tool falls back to the file name. This is common in hand-made or converted EPUBs.

Why was an EPUB refused?

Its XML contained a <!DOCTYPE> or an entity declaration. A normal EPUB never needs them, and they are the usual vehicle for XXE (external entity) tricks, so the tool refuses and says so rather than returning a possibly tainted result.

Is the size breakdown based on compressed or uncompressed size?

On the uncompressed size — that is the real size of the content. EPUBs are usually already compressed internally, and compressed numbers hide how much room the images actually take.

Does it support DRM-protected books?

No. In a DRM-protected EPUB both the content and the keys are encrypted and cannot be read.