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EPUB Metadata Viewer
Choose an .epub file and the viewer opens its ZIP container, checks the stored mimetype entry, follows META-INF/container.xml to the OPF package and lists the book's metadata: package version, title and subtitle, creators and contributors with their role codes, publisher, language, publication and modification dates, subjects, rights and description. Every dc:identifier appears with its scheme; the unique identifier is starred, and values shaped like ISBN-10, ISBN-13 or UUID are labelled, with the ISBN check digit computed. The spine is shown in reading order with each item's idref, href, media type and linear flag, beside a nested table of contents taken from the EPUB 3 nav document or the EPUB 2 NCX. Manifest counts by media type, spine references that point nowhere, extra rootfiles and obfuscated fonts get their own tables, and both the metadata and the table of contents can be exported as JSON files.
File types: .epubProcessing: This browser
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✓ Stays on this deviceMaximum size: 48 MB
How to use EPUB Metadata Viewer
Let it read the file
The file is read and parsed in this browser — nothing is uploaded.
Check the result
Look over what came back, then copy it, download it, or move on.
Want to know how files are handled? Read the privacy notice →
Common questions
How do I view EPUB metadata online without opening the book?
Pick the .epub file and the metadata panel lists title, subtitle, creators with roles, publisher, language, dates, subjects, rights and description straight from the OPF. Each value is shown exactly as the file stores it, odd spacing and line breaks included, so you see what a reading app or bookstore would actually receive rather than a cleaned-up version.
How do I find the ISBN in an EPUB file?
The ISBN sits in a dc:identifier element of the OPF package, and the identifiers table lists every identifier with its scheme and element id, starring the one the package names as unique. A 13-digit (978/979) or 10-digit value is recognised as isbn when its check digit passes or when it is explicitly labelled ISBN, for example with urn:isbn:. The check-digit result itself is saved as isbnChecksumValid in the metadata JSON, so a mistyped labelled ISBN can be spotted there.
Is my EPUB uploaded to a server when I check its metadata?
No. The EPUB is unzipped and parsed inside your browser tab using the browser's own decompression, and it is not sent anywhere. The container, the OPF and the navigation file are read, plus META-INF/encryption.xml when the book has one so protection can be detected; nothing else is decompressed. Results are not saved in browser storage, so closing the tab discards them.
How can I use an EPUB metadata viewer on Windows or Mac without installing Calibre?
Open this page in a current Chrome, Edge, Firefox or Safari on Windows or macOS and choose the file; nothing has to be installed. The tool needs the browser's built-in deflate-raw decompression, so a very old browser reports that decompression is unavailable, and updating it solves that.
Can I check an EPUB's author and table of contents on an iPhone or Android phone?
Yes, in a recent mobile browser: tap the file picker, select the EPUB from Files or Downloads, and the same metadata, spine and contents tables appear. Wide tables scroll sideways on small screens. Older iOS versions that lack the needed decompression support show a clear message instead of partial results.
Why does my EPUB give an invalid mimetype error?
An EPUB must start with an uncompressed entry named mimetype containing exactly application/epub+zip; files re-zipped with an ordinary archiver usually compress it or move it. Export the book again from the program that created it, or use a packaging step that writes mimetype first and stored, then open the new file.
Why does my EPUB show a DRM-protected error with no metadata?
When the file contains Adobe, Apple or Readium licence files, or an encryption.xml covering more than fonts, the viewer stops and shows no metadata, spine or contents. This is deliberate and nothing is decrypted. To see the book's details, use the reading app or store it came from. Books with only font obfuscation are handled differently: their metadata is shown with a note that fonts were not deobfuscated.
What is the file size limit for opening an EPUB here?
An EPUB can be up to 50,000,000 bytes (about 50 MB); larger files are refused before anything inside is read. Each XML part that is read may expand to 16 MiB. Because chapters and images are never decompressed, picture-heavy books under the limit open quickly; ZIP64 archives are not supported at any size.
Is it safe to inspect an EPUB from an unknown source with this viewer?
The viewer only parses the container, the OPF, the navigation file and, if present, encryption.xml as plain data; it never renders chapters, runs scripts or fetches remote resources referenced by the book. Remote references are merely counted as a warning, and XML depth, node and attribute counts are capped. That says nothing about how the book behaves in a reading app that does run scripts.
If an EPUB shows an ISBN with a valid checksum, is the ISBN correct?
Not necessarily. A passing ISBN check digit only proves the digits are internally consistent; it cannot confirm the number was assigned to this book or this edition. Publishers sometimes reuse the print edition's ISBN or carry over a number from another format, so compare it with the copyright page or a catalogue record before relying on it. Likewise, a filled-in metadata panel does not mean every part was readable: if the table of contents is missing or broken, metadata still appears alongside a navigation warning.
What is the difference between the EPUB spine and the table of contents?
The spine is the order a reading device pages through; the table of contents is a navigation menu that can skip files or point inside them. They often disagree: covers and notes may be in the spine but absent from the contents. Spine items marked linear=no are flagged, not hidden. For EPUB 3 the contents come from the nav document, for EPUB 2 from the NCX.
Can I export the EPUB table of contents and metadata to JSON?
Yes. The metadata block and the table of contents each have a JSON download, named after your file, with every value copied verbatim and the unique identifier flagged. That makes them easy to feed into a catalogue or spreadsheet script. If a preview exceeds 120,000 characters it is truncated and the download is withheld.