ORCID, DOIs and Crossref: a researcher’s guide to persistent identifiers

Names change, people move institutions, websites disappear and journals change publishers. Persistent identifiers solve this by giving researchers and their work permanent, unique labels that keep working when everything else changes. The three you will meet most often are the ORCID iD (for you), the DOI (for your work) and Crossref (one of the organisations that makes DOIs work for scholarly publications).

This guide explains each one, how they fit together, and the practical steps worth taking.

ORCID: an identifier for you

ORCID (Open Researcher and Contributor ID) is run by a not-for-profit organisation and gives each researcher a free, unique 16-character identifier, written in four groups, for example 0000-0002-1825-0097. The last character is a check digit and can be the letter X.

Why it matters:

• It separates you from others with the same name. Common names, initials and varied spellings of Indian names (and many others) make author matching unreliable. An ORCID iD removes the doubt.
• It follows you through your career. It stays the same when you change institutions, countries or even your name.
• Many systems ask for it. Journal submission systems, funders and institutions often request or require an ORCID iD.
• It can save time. When your publications carry your ORCID iD, they can be added to your ORCID record automatically, as described below.

Setting up ORCID well

1. Register for free at orcid.org. It takes a few minutes.
2. Add your current and past affiliations, education and any alternative forms of your name.
3. Add your works. You can import them using the search-and-link tools for Crossref, DataCite, Scopus and others, rather than typing them in.
4. Set visibility. You control what is public; making your works and affiliations public is usually most useful.
5. Add a trusted email address, including a personal one, so you do not lose access when you change institutions.
6. Use your iD everywhere: on submissions, your email signature, your CV and your profile pages.

DOIs: an identifier for your work

A DOI (Digital Object Identifier) is a permanent identifier for a piece of content, such as an article, book chapter, dataset or preprint. It looks like 10.1234/abcd.5678: the part before the slash (the prefix) identifies the organisation that registered it, and the part after (the suffix) identifies the item. The DOI system is an ISO standard and is overseen by the International DOI Foundation.

Put “https://doi.org/” in front of a DOI and it resolves to the item’s current location. If the journal moves to a new website or publisher, the publisher updates the record and the DOI keeps working. That is why reference styles increasingly ask you to cite DOIs.

DOIs are issued through registration agencies. Crossref is the main one for scholarly publications such as journal articles, books and conference proceedings. DataCite is widely used for datasets, software and repository content; for example, arXiv and Zenodo assign DataCite DOIs.

Crossref: the infrastructure behind journal DOIs

Crossref is a not-for-profit membership organisation. Publishers, including small university and society journals, join Crossref, register DOIs for their content and deposit metadata: title, authors, ORCID iDs, references, funding information, licence and more. That metadata is openly available and is reused by indexing services, discovery tools and research information systems.

A few things researchers should know:

• Individuals do not normally register DOIs with Crossref. The publisher does. If you want a DOI for a dataset, poster or report you hold yourself, a repository such as Zenodo or your institution’s repository can provide one.
• Costs are modest. Members pay an annual membership fee based on their size, plus a per-item registration fee. In 2026 the fee for a current journal article is USD 1 per DOI. Crossref has announced that this falls to USD 0.95 from January 2027, when registering older (“back-year”) content also becomes free. Small publishers can also join through sponsoring organisations.
• Metadata quality matters. If your journal deposits your ORCID iD with the article, Crossref can, with your permission, update your ORCID record automatically.

Because the real cost is small, be cautious of journals that charge authors large sums “for the DOI”. At CollabCite, the only author cost a partner journal may pass on is the actual Crossref DOI cost, disclosed upfront and backed by proof. See our journal standards.

How to check a DOI is real

Some predatory journals display DOIs that are invented, belong to another item, or were never registered. Before you trust a journal’s DOIs, or cite a paper:

1. Paste the DOI after https://doi.org/ and see whether it opens the correct article.
2. Search the DOI or article title on Crossref’s free search (search.crossref.org) and check that the metadata matches.
3. Look at the prefix. All articles from one journal usually share the same prefix; different, random prefixes are a warning sign.
4. Be suspicious of DOIs that look unusual or lead to the journal’s own homepage rather than the article.

More checks are covered in how to spot a predatory journal.

Other identifiers worth knowing

• ROR (Research Organization Registry) identifies institutions, so your university is recorded consistently.
• ISSN identifies a journal title (print and online versions usually have separate ISSNs). The ISSN Portal lets you check one.
• ISBN identifies books and edited volumes.

A quick checklist

• Register an ORCID iD and keep it up to date.
• Give your ORCID iD every time you submit a paper or grant.
• Include DOIs in your reference list and CV.
• Get a DOI for datasets and other outputs through a trusted repository.
• Check that a journal’s DOIs resolve before you submit to it.

Where CollabCite fits in

CollabCite gives each verified member a CollabCite ID, and anyone can verify a member. It is a collaboration network rather than an identifier registry, and works alongside ORCID: it helps you find co-authors by field and research interest. Join as a founding member to get started.