Look up, verify & cite any DOI
Paste a DOI to check that it resolves and pull the full reference from CrossRef — or search a paper title to find its DOI. Export in APA, MLA, Chicago, Harvard, Vancouver, IEEE, or BibTeX.
Works with bare DOIs, doi.org links, and title searches across 150M+ CrossRef records.
Frequently asked questions
What is a DOI?
A Digital Object Identifier is a permanent ID for a publication, like 10.1038/nature12373. Unlike URLs, DOIs never change, which is why citation styles prefer them.
How do I find the DOI of a paper?
Type the paper title into the search box above — the tool queries CrossRef's 150M+ records and shows the matching DOI. It's usually also printed on the paper's first page.
Why doesn't my DOI resolve?
Either a typo (often a trailing period or bracket from copy-paste), a very recent publication not yet registered, or a fabricated DOI — AI writing assistants regularly invent plausible-looking DOIs that don't exist.
Which citation style should I use?
Whatever your department or target journal mandates: APA dominates the social sciences, MLA the humanities, Vancouver medicine, IEEE engineering. This tool exports all of them, plus BibTeX for LaTeX users.
More free tools
One bad DOI is rarely alone.
Check My Thesis verifies every citation in your document against 200M+ papers — and flags the ones that don't hold up.
Scan your thesis free