Is the reference checker free?

Yes — you can verify up to 25 references per run, free, with no sign-up. The single-list checker stays free forever.

How does it decide a citation is real?

Every reference is looked up in real bibliographic databases (Crossref, and via DOI resolution). A source is only ever “verified” by a hit against a real database — never by an AI, and Corroba never invents a source to fill a gap.

Does it use AI to check my references?

No. The verdict is grounded entirely in real database lookups — that's the whole point, since AI tools are what hallucinate citations in the first place.

Can it check ChatGPT or Gemini citations?

Yes — that's exactly what it's for. There's also a dedicated AI-citation checker framed for verifying references from ChatGPT, Claude, and Gemini.

Corroba Verify

Check your citations are real — before you submit.

Wrote a paper with help from ChatGPT, Claude, or Gemini? Paste your reference list and Corroba checks every entry against real databases — flagging anything hallucinated, mismatched, broken, or retracted, and showing the real source when one exists. The safety net for an era where half your sources might come from an AI. Grounded in Crossref — never invented.

Up to 25 references per run · always free

What Corroba Verify catches

✓

Verified

The reference matches a real record in Crossref or via its DOI — with the source shown.

⚠

Check details

A real record exists but the details differ — a real DOI on the wrong title is a classic AI tell.

✗

Broken DOI

The cited DOI doesn't resolve. Fix the identifier or replace the source.

Not found

No matching record exists in the databases we search — a common sign of a hallucinated citation.

⛔

Retracted

The work has been retracted or withdrawn. Don't cite it as current research.

How it works

1
Paste your reference list
One per line, numbered, or blank-line separated — however your bibliography is formatted.
2
We look up each one in real databases
Corroba resolves every reference against Crossref and DOI records — the same authoritative sources reference managers use.
3
Get a verdict + the real source
Each reference gets a status and, where one exists, the authoritative record to copy — so you can fix problems before you submit.

Questions

Is the reference checker free?: Yes — you can verify up to 25 references per run, free, with no sign-up. The single-list checker stays free forever.
How does it decide a citation is real?: Every reference is looked up in real bibliographic databases (Crossref, and via DOI resolution). A source is only ever “verified” by a hit against a real database — never by an AI, and Corroba never invents a source to fill a gap.
Does it use AI to check my references?: No. The verdict is grounded entirely in real database lookups — that's the whole point, since AI tools are what hallucinate citations in the first place.
Can it check ChatGPT or Gemini citations?: Yes — that's exactly what it's for. There's also a dedicated AI-citation checker framed for verifying references from ChatGPT, Claude, and Gemini.

Verifying citations from an AI chatbot? Try the AI citation checker →

Once your references check out, make sure you used them honestly — check your writing against your sources with Corroba Integrity →