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Why does my ORCID iD have an X?

ORCID Support
  • Updated

ORCID iD's that end with an X are valid and correct.

The last character of an ORCID identifier is a Checksum. It ranges in values from “0” - “10,” with X representing the value “10.” The Checksum ensures the other 15 digits of your identifier form a coherent iD.

Please also note that that the "X" must be capitalized in order for the ORCID identifier to be valid.

You can learn more about the structure of an ORCID identifier here.

Identifiers are randomly assigned, and cannot be changed.

Checksums examples with an X

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