ORCID Validator

What is ORCID and why every researcher needs one

ORCID stands for Open Researcher and Contributor ID. It is a persistent, machine-readable identifier that distinguishes one researcher from another across institutions, journals, datasets and grant agencies. Imagine a database with hundreds of "J. Silva", "Y. Wang" or "M. Garcia" papers; without a stable identifier, automated systems cannot tell who wrote what. ORCID solves this name-disambiguation problem by binding each scholar to a single 16-digit URI of the form https://orcid.org/0000-0002-1825-0097.

ORCID was founded as a non-profit consortium in 2010 and went live in October 2012, after years of debate within ICSU, CODATA and CrossRef on how to fix author attribution at internet scale. Today the registry contains more than 20 million live IDs, governed by ORCID Inc., a member-driven organization headquartered in the United States with regional hubs in Europe, Latin America and Asia-Pacific. Registration is and will remain free for individuals; institutions and funders pay tiered membership fees to access richer write APIs.

Anatomy of the 16-digit identifier

An ORCID iD is 16 digits split into four blocks of four, separated by hyphens. Example: 0000-0002-1825-0097. The first 15 positions are randomly assigned from a controlled range (currently 0000-0001-5000-0000 through 0000-0003-5000-0000), and the 16th position is a checksum that may be a digit or the letter X (used to represent the value 10). Hyphens are purely cosmetic and must be ignored during validation.

• Length: exactly 16 base-10 characters plus optional hyphens.
• Charset: digits 0-9; the last position may also be X.
• Canonical form: prefixed by https://orcid.org/ to form a resolvable URI.
• Reserved range: prevents collisions with ISNI (International Standard Name Identifier) which shares the same algorithm.

ISO/IEC 7064 MOD 11-2 checksum, step by step

The check digit is computed via the ISO/IEC 7064 MOD 11-2 algorithm — the same one used by ISNI. The procedure is iterative and trivial to implement:

let total = 0;
for (const digit of first15Digits) {
  total = (total + Number(digit)) * 2;
}
const remainder = total % 11;
const result = (12 - remainder) % 11;
const checkDigit = result === 10 ? 'X' : String(result);

Walking through 0000-0002-1825-0097: after processing the first 15 digits the running total reaches a value whose modulo 11 equals 5, so (12 - 5) % 11 = 7, which matches the published check digit. When the result is 10, the literal character X is used instead, which is why some ORCIDs end in X — those are perfectly valid and must not be rejected by a naive numeric parser.

Where ORCID is required and where it is just useful

Almost every major scholarly publisher — Elsevier, Springer Nature, Wiley, Taylor & Francis, IEEE, ACM, PLOS, eLife, MDPI — auto-links submissions to the corresponding ORCID record, automatically pushing newly accepted DOIs into the author's profile via the CrossRef and DataCite hooks. Funders such as the NIH, Wellcome Trust, ERC, Horizon Europe and (in Brazil) CNPq, CAPES and FAPESP increasingly require ORCID on grant applications. The Plataforma Sucupira for postgraduate programs accepts ORCID as a complementary identifier alongside the Lattes CV.

Use cases beyond publication: institutional repositories (DSpace, Eprints), preprint servers (bioRxiv, arXiv, SciELO Preprints), peer-review credit systems (Web of Science Reviewer Recognition), data repositories (Figshare, Zenodo, Dryad), conference submission systems (OpenReview, EasyChair), and even ORCID-based OAuth single sign-on for academic SaaS.

ORCID compared with ResearcherID, Scopus Author ID and Lattes

• ResearcherID (now part of Web of Science / Clarivate): proprietary, tied to a paid subscription. Many institutions sync it with ORCID via the bi-directional WoS-ORCID bridge.
• Scopus Author ID: automatically assigned by Elsevier; not author-managed. The Scopus to ORCID wizard lets you import all matched publications in one click.
• Lattes (Plataforma Lattes, Brazilian CNPq): the gold standard for Brazilian CV management; complements but does not replace ORCID. Lattes harvests publication lists; ORCID exposes them to international systems.
• ISNI: covers a wider population (authors, performers, organizations) and uses the same MOD 11-2 algorithm; ORCID iDs are a reserved subset of the ISNI namespace.

FAQ

Is ORCID really free?

Yes. Individual registration, profile management and all read APIs are free forever. The non-profit covers infrastructure with membership fees paid by universities, publishers and funders.

Do I need ORCID to publish in Brazil?

Most international journals require it for the corresponding author, and many Brazilian journals indexed in SciELO recommend it. CNPq and CAPES expect ORCID on grant submissions, so it is effectively mandatory for active researchers.

Does ORCID replace the Lattes platform?

No, they are complementary. Lattes provides the structured CV expected by Brazilian agencies; ORCID propagates publication lists to international systems. Sync the two through the Lattes-ORCID widget.

Why does my ORCID end with the letter X?

The MOD 11-2 algorithm can produce a check value of 10, which is represented by the literal character X. It is fully valid; any parser that rejects it is broken.

Can a single researcher have two ORCID iDs?

Not officially. Duplicates can be merged via the ORCID account settings: the secondary record becomes deprecated and redirects to the primary one, preserving all linked works.