Direct comparison
ISBN vs. DOI: Key Differences Explained
ISBN identifies a book edition for cataloguing; DOI resolves a digital object online. Compare scope, assignment, format, and when a book needs both.
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How do ISBN, DOI compare side by side?
The table below compares ISBN, DOI across 9 procurement-relevant dimensions, from what it identifies through do they connect?.
Side-by-side comparison
| Dimension | ISBN | DOI |
|---|---|---|
| What it identifies | A specific edition/format of a book (hardback, paperback, ebook each get their own) | Any digital object: journal article, dataset, software, monograph, or individual book chapter |
| Governing standard | ISO 2108 | ISO 26324 (DOI syntax), maintained via the DOI Handbook |
| Assigning body | National/regional ISBN agencies under the International ISBN Agency (e.g. Bowker in the U.S.) | DOI Registration Agencies under the International DOI Foundation — chiefly Crossref (publisher content) and DataCite (data, software, and increasingly monographs) |
| How it's chosen | Fixed by publisher's country/region — no choice of agency | Registrant chooses an RA based on content type and community |
| Format | 13 digits, starts with 978 or 979 (10 digits for pre-2007 legacy ISBNs) | Alphanumeric, opaque, case-insensitive: <prefix>/<suffix>, e.g. 10.1038/nature14539 |
| Resolution | Not directly resolvable online — used for lookup in bibliographic/retail databases | Resolves as a persistent link via https://doi.org/ through the DOI Handle System |
| Granularity for a book | One per edition/format of the whole volume; a book chapter does not get its own ISBN | Can be assigned at the book level AND separately to each individual chapter |
| Primary purpose | Ordering, cataloguing, and retail/library supply-chain tracking | Persistent citation, linking, and machine-resolvable access to the digital object |
| Do they connect? | Can be expressed inside the DOI System as "ISBN-A" (an actionable ISBN in DOI syntax), if the assigning agency offers that service | Can wrap a 13-digit ISBN as an ISBN-A, but a bare ISBN alone does not resolve in the DOI System |
Common questions
Common questions about ISBN vs DOI
Does a book need both an ISBN and a DOI?
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Most published monographs benefit from both, but for different reasons. The ISBN is what lets the book be catalogued, ordered, and sold through normal book-trade and library channels. The DOI is what lets it be cited and resolved persistently online. University-press and open-access monographs increasingly carry both; older or print-only titles may only have an ISBN.
Can a book chapter have its own DOI without its own ISBN?
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Yes. ISBNs are assigned at the whole-book level, so an individual chapter in an edited volume does not get a separate ISBN. DOIs, by contrast, can be assigned per chapter as well as for the book as a whole — many edited volumes have one DOI for the full book plus a distinct DOI for each contributed chapter.
How do I find the DOI for a book if I only have its ISBN?
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Search the book's 13-digit ISBN at Crossref's search.crossref.org. If the publisher registered a DOI for that specific edition, it will appear in the returned metadata.
What is ISBN-A?
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ISBN-A ("the actionable ISBN") is a way of expressing an existing 13-digit ISBN inside the DOI System's syntax, so it becomes resolvable the way a DOI is. It can only be registered by a DOI Registration Agency that is also an ISBN agency, and it coexists with the conventional ISBN rather than replacing it — a bare ISBN on its own is not resolvable in the DOI System.
