Quick Answer
An ISSN identifies a journal as a whole publication (the title), while a DOI identifies one specific article, dataset, or item of content within that journal and resolves directly to it online. An ISBN plays a similar role to ISSN but for books. You typically need an ISSN before Crossref will register DOIs for your journal, but the two identifiers serve different purposes and neither substitutes for the other.
Side-by-Side Comparison
| Identifier | Identifies | Assigned By | Example |
|---|---|---|---|
| ISSN | A journal title (the whole publication) | National/international ISSN centers | 2049-3630 |
| DOI | One specific article, dataset, or item | Crossref (via direct or sponsored membership) | 10.5555/j.jss.2026.01.002 |
| ISBN | A specific book or monograph edition | National ISBN agencies | 978-3-16-148410-0 |
Why Journals Need Both an ISSN and DOIs
Think of the ISSN as your journal's permanent "name tag" - it identifies the publication itself, regardless of which issue or article. A DOI, by contrast, is assigned to each individual article and lets that specific piece of content be found, cited, and linked forever, even if the journal's website changes. Crossref requires the ISSN precisely because it needs to know which journal each DOI-registered article belongs to - see do I need an ISSN before registering DOIs?
Do Books Need DOIs Too?
Yes - books, book chapters, and conference proceedings can also be registered with DOIs through Crossref, separately from their ISBN. The ISBN identifies the edition; the DOI (if the publisher chooses to register one) identifies the specific digital record and allows the same persistent-linking and citation-tracking benefits that journal articles get.
Other Identifiers You Might Encounter
| Identifier | What It's For |
|---|---|
| ORCID | Identifies individual researchers/authors, not content |
| Handle | A general-purpose persistent identifier system; DOI is built on top of the Handle System |
| ARK | Another persistent identifier scheme, more common in library/archive contexts |
For a deeper comparison of DOI against these related systems, see Crossref DOI vs Other Identifiers.