Inspect
EPUB Inspector
Upload an EPUB file to see everything inside it. The inspector reads the OPF package, manifest, spine, table of contents, cover image, and all linked files. Use it to understand what an EPUB contains before converting, editing, or submitting it to a reading platform.
Input formats
Output formats
Common uses
- Check what metadata an EPUB contains before editing
- Inspect the file structure before submitting to a publisher
- Find out why an EPUB is large by seeing which files take the most space
- Check whether a table of contents is present and correctly structured
Limitations
- DRM-protected EPUBs cannot be inspected — the content is encrypted.
- Very large EPUBs (over 100 MB) may be slow to parse in the browser.
Your e-book files, handled privately
This tool runs entirely in your browser. Your files are never uploaded to a server. This tool does not remove DRM or bypass copyright protection. Only upload files you own or have permission to process.
Frequently asked questions
No. The inspector only reads the file. Nothing is changed or uploaded.
The OPF (Open Packaging Format) file is the main descriptor inside an EPUB. It lists all the book's files, metadata, and reading order.
The spine defines the reading order of chapters inside an EPUB. Spine items are the HTML files that make up the book content, listed in the order a reading app will display them.