Free DOI validator
Paste a list of DOIs or your whole BibTeX file and check every DOI against CrossRef in one click. Catches dead, mistyped, and unverifiable references before a reviewer does. No account required.
Why verify DOIs before submitting?
A single dead or mistyped DOI sends reviewers to a broken link and signals a rushed submission. DOIs are copied by hand and rarely re-checked, and references drafted with AI tools can include plausible-looking DOIs that resolve to nothing. Verifying the whole bibliography at once catches these in seconds.
Want figures, tables, and float placement checked too? Run a full pre-submission check.
Frequently asked questions
What does it mean if a DOI is invalid?+
An invalid DOI does not resolve on CrossRef - the publisher's record cannot be found. It is usually a typo, a transposed character, or a fabricated reference. Re-copy the DOI from the publisher's page.
Why is a reference marked 'unverified' instead of valid?+
Entries without a DOI are matched by title against CrossRef. A low match score means the title could not be confidently found - worth checking, but not necessarily wrong.
Is my data stored?+
No. DOIs and BibTeX you paste are checked against CrossRef in the request and not saved. This tool needs no account.