What Is a DOI and Why Your Paper Needs One

A DOI keeps your paper findable and citable after websites change. It does not prove a journal is legitimate, and knowing the difference protects you.

Explainer · 8 min read · Directive Publications Editorial Team

What a DOI is

A DOI, or digital object identifier, is a permanent name for a piece of content. For a journal article, it is the string you see on the first page of the PDF that starts with 10. and looks something like 10.1000/182.

The DOI system is an international standard, ISO 26324, and is governed by the not-for-profit DOI Foundation. The foundation does not issue DOIs to individual works itself. That is done through registration agencies, each serving a community. For journal articles, the agency you will meet most often is Crossref. For datasets and software, it is often DataCite.

What makes a DOI useful is not the string itself but what sits behind it. When a publisher registers a DOI, it records metadata about the work (title, authors, journal, dates and more) and a URL for the landing page. The resolver at doi.org then sends anyone who follows the DOI to that URL. If the journal moves to a new website, the publisher updates the URL in the registration record, and the DOI keeps working. The address can change; the name does not.

That is the whole idea: a stable name, a registered record, and a link that someone is obliged to keep current.

How to read a DOI

Every DOI has two parts, separated by the first forward slash.

A few practical points follow from how DOIs are built:

• The prefix shows who originally registered it. Directive Publications, for example, registers its articles under the Crossref prefix 10.52338. When a journal changes publisher, its existing DOIs keep the old prefix and new articles go under the new owner's prefix, so one journal can have DOIs with different prefixes. That is normal, not a sign of a problem.
• The suffix is not meant to mean anything. Crossref advises its members to make suffixes "opaque", without embedded dates, page numbers or journal abbreviations. Do not try to read the year or volume from a suffix.
• DOIs are case-insensitive. 10.1006/ABC and 10.1006/abc point to the same thing, so a capitalisation difference between your reference manager and the journal site is not an error.

Crossref's display guidelines ask members to show DOIs as a full link, https://doi.org/10.xxxx/xxxxx, rather than with a doi: label or the older dx.doi.org address. When you write your own reference list, follow your target journal's reference style, but if it gives you a choice, the full https link is the format Crossref recommends.

Why your paper needs one

It stays citable when websites change

Journal websites get redesigned, publishers merge, and platforms migrate. A plain URL in someone's reference list can break with any of those changes. A registered DOI is designed to survive them, because the publisher is responsible for updating the link. Crossref's membership terms require members to keep their DOIs resolving to a landing page with current metadata.

Citations and links can find your paper

Reference lists that include DOIs are much easier to match by machine than reference lists that rely on author names and abbreviated journal titles. Crossref members are expected to link the references in their own articles using DOIs, so a paper with a registered DOI can be linked to from the papers that cite it.

Your metadata travels with it

When the publisher registers your DOI, the metadata it sends (your name, co-authors, affiliations, title, publication date) becomes part of a shared record that other services draw on. This is why the author details you give at submission matter. On the Directive Publications submission form, for example, the co-author names, affiliations and emails you enter are used for the published author list and DOI registration. A misspelled name at submission can end up in that record.

Corrections stay attached

Because the DOI is the stable reference point for an article, later notices can be linked to it. Some publishers add Crossmark, an optional Crossref service that shows readers with one click whether the article has been corrected, updated or retracted. That protects readers who reach your paper through an old link.

A DOI is not a quality badge

This is the misunderstanding that costs early-career authors the most.

A DOI shows that someone registered the content with an agency. It does not show that the paper was peer reviewed, that the journal has a real editorial board, or that the publisher is trustworthy. Crossref has said this plainly: registering a DOI is sometimes taken as a seal of approval, which it calls a fundamental misunderstanding, because "a DOI is a tool, not a badge of honor".

So treat a journal's promise that "every article gets a DOI" as a basic expectation, not a reason to submit. Judge the journal on the things a DOI cannot tell you, using a checklist such as our 12 red flags of predatory journals.

There is one quick check a DOI does allow. If a journal claims to register DOIs, take a DOI from one of its published articles and:

1. Follow it as https://doi.org/ plus the DOI. It should land on the journal's own article page, not an error page or an unrelated site.
2. Look up the prefix at https://doi.org/ra/ followed by the prefix (for example https://doi.org/ra/10.52338). The response names the registration agency, such as Crossref or DataCite.
3. If you see "DOI Not Found" on doi.org, that DOI has not been registered. A journal printing DOIs that do not resolve is a warning sign worth asking about.

None of this proves quality. It only confirms that the DOI claim itself is real.

How to find a DOI

You will need DOIs for your own reference list. Check your target journal's author instructions to see whether it asks for them on every reference and in what format.

Start with the article itself. The DOI is usually on the landing page near the title and on the first page of the PDF.

Search Crossref. Crossref Metadata Search (search.crossref.org) lets you search the metadata of journal articles, books, datasets and more by title or author.

Match a whole reference list. Crossref's free Simple Text Query tool takes pasted references, up to 1,000 per submission, and returns the DOIs it can match. Check every match by eye; a near-miss title can return the wrong paper.

Search PubMed. PubMed records include DOIs supplied by publishers. To search by DOI in PubMed, put the DOI in double quotes and leave off the https://doi.org/ part, which PubMed does not index.

Generate a citation from a DOI. The DOI Citation Formatter (citation.doi.org) turns a DOI from Crossref, DataCite and several other agencies into a formatted citation. Treat the output as a draft and check it against your journal's style.

Things that look like the same paper but are not

• Preprints. A preprint usually has its own DOI, separate from the journal article. medRxiv, for example, gives each preprint a DOI and adds a link to the published version, usually within about two weeks of journal publication. Our guide to preprints, accepted manuscripts and versions of record explains which version to cite.
• Data and software. Datasets and code often have DataCite DOIs from repositories. Zenodo, for example, registers a DOI for every upload by default. Cite them as you would a paper; our post on citing data, software and code covers the format.
• Corrections and retraction notices. Publishers typically issue a correction or retraction as a separate notice with its own DOI, linked to the original article, which is the approach Crossref recommends. Make sure you are citing the article, not the notice, unless the notice is what you mean.

What to check on your own paper

When your paper is accepted, the publisher registers the DOI as part of production. You do not need to apply for it, but you should check the result.

1. Before submission, every reference with a DOI includes it, in the format your target journal asks for
2. Each DOI in your reference list resolves to the paper you meant to cite
3. Author names, order and affiliations on the proofs are exactly right, because they feed the DOI metadata
4. After publication, your DOI resolves at https://doi.org/ to the article landing page
5. You use the full DOI link in your CV, ORCID record, grant reports and repository deposits
6. If you posted a preprint, the preprint now links to the published article

If a DOI on your published paper does not resolve, contact the journal rather than waiting. Only the publisher can correct its registration record.

At Directive Publications, every accepted article receives a Crossref-registered DOI under prefix 10.52338 and is published open access under CC BY 4.0, as set out on our peer review page. When your manuscript is ready, you can submit it here.