Enter a DOI (up to 15, separated by commas), a single ISSN, ISBN, ORCID, or PMID to retrieve article metadata, metrics, retraction status, and more. Any other text searches CrossRef. Prefix with worldcat or book to search WorldCat instead.
2025: CrossRef registered 13.2M, where 8.75M are academic (articles, preprints, reports) · DataCite 1M academic · together ~95% of 2025 academic DOIs globally.