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Merge PDF
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EPUB Metadata Viewer
Reads an EPUB package file and shows every metadata field, the resource breakdown, and whether the book is DRM-protected.
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Drop an EPUB filenothing is uploaded
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In short
An EPUB's metadata lives in its OPF package file as Dublin Core elements — dc:title, dc:creator, dc:publisher, dc:language, dc:date and dc:identifier. The identifier is where the confusion is: EPUB puts the ISBN, a UUID and any publisher code into that same element type, distinguished only by a scheme attribute many tools omit, so a book can carry three identifiers with nothing saying which is authoritative. Cataloguing software generally takes the first. Whether a book is DRM-protected is a separate question, answered by the presence of META-INF/encryption.xml — and metadata stays readable even when the content is encrypted.
How to use the EPUB Metadata Viewer
- Drop the .epub file in.
- Read the metadata table.
- Check the DRM line before planning to convert the book.
About the EPUB Metadata Viewer
The EPUB Metadata Viewer reads an EPUB package file and shows every metadata field, the resource breakdown, and whether the book is DRM-protected. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.
What people use it for
- Checking a book's ISBN and publisher before cataloguing it.
- Finding out whether a book is DRM-protected.
- Seeing how many images a book contains.
Details
| Metadata standard | Dublin Core, inside the OPF package file |
|---|---|
| Identifier | ISBN, UUID and publisher codes share one element type |
| DRM marker | META-INF/encryption.xml |
| EPUB 2 vs 3 | The version attribute on the package element |
The resource breakdown is a quick way to tell a real ebook from a scan. A text ebook is mostly XHTML with a handful of images; a scanned one is almost entirely JPEGs with one XHTML wrapper per page, and no amount of text extraction will help it.
Where this tool stops
Reads the package metadata. Series data, page-progression direction and accessibility metadata live in EPUB 3 refinements that differ between publishers and are not interpreted.
Frequently asked questions
Which identifier is the real ISBN?
Whichever has an ISBN scheme attribute — and if none does, the one that looks like an ISBN, which is what this tool reports separately. A book can legitimately carry a UUID as its unique identifier and an ISBN as a second identifier, and nothing in the file ranks them.
How can I tell if a book has DRM?
The presence of <code>META-INF/encryption.xml</code>. Note that its absence is not quite a guarantee — a few shops use social DRM, which embeds the buyer's name in the text rather than encrypting anything, and leaves no marker at all.
Why does the metadata read fine on a DRM book?
Because it is deliberately left unencrypted. A shop or library still needs to show the title, author and cover of a book you have not unlocked, so only the content documents are protected.
Does the EPUB Metadata Viewer cost anything?
There is no cost and no cap. The EPUB Metadata Viewer is not a demo of a paid product, so nothing is held back or watermarked.
Can you see what I put into this tool?
No. The EPUB Metadata Viewer runs entirely in your browser using JavaScript. Nothing is transmitted, logged or stored, which you can verify yourself in the Network tab of your browser's developer tools.
What do people use the EPUB Metadata Viewer for most?
Typical uses: checking a book's ISBN and publisher before cataloguing it. Finding out whether a book is DRM-protected. Seeing how many images a book contains. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Where does the EPUB Metadata Viewer stop being reliable?
Reads the package metadata. Series data, page-progression direction and accessibility metadata live in EPUB 3 refinements that differ between publishers and are not interpreted. Knowing where a tool stops being trustworthy matters more than the cases where it works.
What are the key numbers for the EPUB Metadata Viewer?
Metadata standard is Dublin Core, inside the OPF package file. Identifier is ISBN, UUID and publisher codes share one element type. DRM marker is <code>META-INF/encryption.xml</code>. These are printed on the page itself, so you do not have to take them on trust.
Will a big file be rejected?
There is no limit set by us, because your file is never uploaded — the only ceiling is the memory your own browser will give the tab. Very large files simply take longer to process, and a phone will give up sooner than a desktop.
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