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Free DOI and Retraction Checker

Paste DOIs or a reference list to see whether each DOI exists, whether a retraction, correction or expression of concern is listed, and whether a free full-text copy is available.

Only the DOIs you enter are sent to our server, which looks them up at Crossref, OpenAlex, the DOI Foundation and Unpaywall.

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How to read the results

“No notices found” means none of the sources we checked lists one. It does not prove a paper is sound, and notices can take days to appear.

Why a DOI might not be found

A typo, a very new DOI, or a registry with limited metadata. We try several sources before saying a DOI cannot be found.

Where the data comes from

Crossref (which also carries Retraction Watch data), OpenAlex as a fallback, the DOI Foundation’s resolver, and Unpaywall for open-access copies.

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