How CiteTools Verifies Citation Accuracy

A converter that hands you a tidy citation tells you nothing about whether its details are right. CiteTools labels every result with how it was reached, so you know which citations to check against your source before you submit.

Result Labels, and No Percentages

Every converted citation carries one of these labels under the result:

• Confirmed – a published record matched your input, and the citation is built from that record. The label names its source, for example “Confirmed by Crossref” or “Confirmed by its DOI record”.
• As written – the citation is formatted from the details you gave, and no registry record replaced them. A BibTeX or RIS entry gets this label, because it is formatted from its own fields.
• Not confirmed – no registry held one matching record, so the citation uses only what your text states.
• From the page – the citation comes from the details the page itself publishes, because a web page has no registry record to read. Check the author and the date against the page. A web address that leads to a DOI record still reads Confirmed.

Hover over a label, or tap it, to read what it means for that result. There is no score to interpret. A record either matched or it did not.

What Earns “Confirmed”

An identifier in your text. CiteTools finds a DOI, an ISBN, a PubMed id or an arXiv id even when it sits among other words, looks up its registered record and cites that. A DOI resolves through DOI.org, then Crossref, then DataCite, which holds the DOIs of arXiv preprints and many datasets (see how to cite a preprint). A PubMed id resolves through PubMed. An ISBN is looked up in Google Books, then in Open Library and K10plus, the shared catalogue of most German university libraries.

A reference with no identifier. CiteTools searches for its title in Crossref, in PubMed for a medical reference, in DBLP, which indexes computer science, and where it is enabled in OpenAlex. A reference that reads as a book skips PubMed, DBLP, OpenAlex and Crossref’s second, title-only search, and looks in Google Books, Open Library and K10plus instead. A reference that reads as an article skips the book sources. A record found this way is adopted only when all of this holds:

• Its title agrees with the title you pasted.
• No author you stated contradicts it.
• Its year is at most one year away from yours. A book skips this rule, because editions of one book carry different years.
• Enough else agrees: the authors, the exact year, or the journal or publisher. A short title needs more agreement than a long one.

When two different works both fit, CiteTools adopts neither and tells you so. A wrong match would be worse than no match.

What a Confirmed Result Shows You

When a record changes your reference, the row lists each change under the citation. You might read “Corrected from the record: year 2014 to 2015, volume added, issue added, pages added, DOI added”. The badge counts the corrections, as in “Confirmed by Crossref, 1 corrected”. Fields the record only added are not counted. Nothing is corrected silently.

If the record changed or removed something you pasted, the row offers “Keep what I pasted”. Select it and the row uses your version, reads “As written”, and says “The record differs from what you pasted”. “Use the record” switches back.

Books follow a stricter rule, because one title has many editions. A record from Google Books, Open Library or K10plus never overrides a year, publisher or edition that you stated. It only fills in what is missing, and a filled year or publisher comes with a note to check it against your copy.

When Nothing Confirms It

A Not confirmed label is not a sign that your reference is wrong. The reference checker page says its databases index journal articles, conference papers and preprints. It says books, book chapters, theses, reports, legal sources and most websites are outside their coverage. The converter reads largely the same registries, plus book sources, so a real work can go unmatched. The citation is formatted from your text, and a field your text does not state is never filled in from an AI model’s memory. Check it against your source, or add the DOI and convert again.

If a registry did not answer during the lookup, the result says that the check is incomplete. Try again in a moment, because the record may be there.

Retracted Works

A row carries a red “Retracted” badge when Crossref, PubMed or OpenAlex marks the work as retracted, also when the mark sits on another record of the same work. The tooltip reads “A registry marks this work as retracted.” When the registry links a notice, the tooltip adds “Read the notice before you cite it”. The row then adds a link, “Read the retraction notice”. The label changes nothing else: the citation stays as it was, so the decision to cite the work is yours.

The retraction check is a separate lookup. If it fails, a Confirmed row says “We could not check whether this work has been retracted. Try again in a few minutes.” No badge then does not mean the work is clean. Paste the reference again later, and check the journal’s page for a notice before you cite a paper you have doubts about.

Warnings That Travel With a Result

Some results carry a short warning that names one specific problem:

• An identifier that belongs to another work. If the DOI in a complete reference points to a different paper, CiteTools removes the DOI and says which work it belongs to.
• Shortened authors. A reference that ends its author list with “et al.” is formatted as given, with a prompt to add the missing authors or the DOI. A record that supplies the full list removes the warning.
• Several references in one entry. When one entry still holds more than one reference, only the first is converted, and the warning says how many were left.

What CiteTools Will Not Do

A title on its own is too thin to name one work, so CiteTools does not guess. It searches the registries and shows a short list headed “Which one do you mean?” with up to five matches, each with a DOI or an ISBN. You pick the work, and the pick is cited by its identifier. If none fits, add the author and year, or paste the DOI. An identifier that has no record gets a plain message, and you can paste the full reference instead.

The same labels apply to every row of a list. Paste up to 100 references and each row carries its own state and its own warnings, as described in adding a whole bibliography to your list and in managing 100+ sources.

For the full rules behind each label, read the tool methodology. For background on the identifier that confirms most journal articles, see what is a DOI.

Try It with CiteTools

Paste a DOI into CiteTools.io and the result reads “Confirmed by its DOI record”. Then paste a messy reference from an old reading list and see which label it earns, and what CiteTools changed to get there.