Citation CheckerOnline

Reference integrity workspace

Citation Checker

Audit a reference list for DOI problems, duplicate sources, missing publication details, and metadata mismatches before you submit.

References stay in this browser Metadata from Crossref Free forever · No sign-up · No usage credits
Citation Checker
Local analysis · DOI-only lookup
0 entries detectedMaximum 25 DOI lookups per run

About this audit

Find reference problems that formatting generators miss

A citation can look polished while pointing to the wrong paper, repeating the same source, or carrying a mistyped DOI. This checker separates references, validates DOI syntax, retrieves publication metadata from Crossref, and compares it with the text you supplied.

Checks run locally except for individual DOI lookups. Results are evidence for review rather than a guarantee that a bibliography satisfies every journal, university, or style-guide requirement.

Three-step workflow

Run a focused reference check

  1. Paste one reference per line or use blank lines between entries.
  2. Run the audit and review DOI, metadata, and duplicate warnings.
  3. Copy the cleaned list or export the report as CSV.
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 Citation Checker

What does the citation checker verify?

It checks reference boundaries, years, DOI syntax, DOI resolution, Crossref title matches, exact DOI duplicates, and likely text duplicates.

Does it rewrite my references?

It removes exact duplicate lines when you copy the cleaned list. It does not silently invent or replace missing publication details.

Are my references stored?

The list is processed in your browser. Only extracted DOI strings are sent to the lookup endpoint and cached with public Crossref metadata.

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