BibCheck — free BibTeX & citation checker

Check your .bib file for duplicates, missing keys, and orphans. Paste your bibliography, click once, and get a line-by-line problem report.

What BibCheck does

Paste your .bib file — and optionally your manuscript text (.tex or plain) — then click Check for issues.

Flags duplicate keys and matching titles, broken cite keys, and missing references.
Missing/orphan-citation checks against your manuscript text: entries you never cite, and citations with no .bib entry.
Optional Verify citations — checks each entry against live scholarly databases (adds ~30 seconds).
Free during the pilot, no sign-up needed — daily limits apply for fair use.