Free DOI Lookup Tool
Enter a Digital Object Identifier (DOI) to retrieve full citation metadata from CrossRef. Choose your preferred citation style and copy the formatted reference with one click.
What Is a DOI?
A Digital Object Identifier (DOI) is a unique alphanumeric string assigned to academic articles, books, datasets, and other scholarly works. DOIs provide a permanent link to the content, regardless of where it is hosted. For example, the DOI 10.1038/s41586-020-2649-2 points to a specific article published in Nature.
How This Tool Works
When you enter a DOI, we query the CrossRef API -- one of the largest academic metadata databases covering over 150 million records. We retrieve the title, authors, year, journal, volume, issue, and page numbers, then format them in your chosen citation style (APA, MLA, Chicago, Harvard, IEEE, or Vancouver).
Supported Citation Styles
- APA (7th edition) -- Psychology, education, social sciences
- MLA (9th edition) -- Humanities, literature, language studies
- Chicago -- History, arts, some social sciences
- Harvard -- Common in UK and Australian universities
- IEEE -- Engineering, computer science, technical fields
- Vancouver -- Medicine, health sciences, biology