Bibliography duplicate finder

Reference Deduplicator

Detect exact duplicates, repeated DOI names, and near-matching references that differ only in punctuation or formatting.

References stay in this browser Metadata from Crossref Free forever · No sign-up · No usage credits

Reference Deduplicator

Local analysis · DOI-only lookup

References to deduplicate

0 entries detectedMaximum 25 DOI lookups per run

About this audit

Find the same source hiding behind different formatting

Duplicate references are not always identical strings. One version may abbreviate an author, include a DOI URL, omit a subtitle, or use different punctuation. This tool combines exact DOI matching with normalized token similarity to identify likely duplicate pairs.

Near-duplicate detection is deliberately conservative. Review suggested pairs before removing an entry because related papers, editions, corrections, and conference versions can share many words without being the same source.

Three-step workflow

Run a focused reference check

Paste the complete reference list.
Review exact and likely duplicate groups.
Copy the list with exact duplicates removed.

01Parse locally

Your reference text is separated and normalized inside the browser.

02Resolve identifiers

Only detected DOI names are sent for public Crossref metadata lookup.

03Compare evidence

Registry titles, years, identifiers, and text similarity become review findings.

04Keep editorial control

The report flags uncertainty instead of silently inventing missing source details.

Frequently asked questions

Questions about Reference Deduplicator

How are duplicates detected?

Exact normalized text, identical DOI names, and high token similarity are used as separate signals.

Will the tool delete similar references automatically?

Only exact normalized duplicates are removed automatically. Near matches remain visible for manual review.

Does it work with mixed citation styles?

Yes, although inconsistent styles can increase the number of near-match suggestions.