warnings, caveats and weasel words

Most of the experiments linked to here are running on R&D equipment in a non-production environment. They may disappear without warning and/or perform erratically. If one of them isn’t working for some reason, come back later and try again.


  • FundRef Widget: An open-source reference implementation widget for gathering FundRef data from researchers.
  • FundRef Reconciliation Service: A tool to allow organisations to clean-up and map their internal funder name metadata to the FundRef registry.
  • CrossRef Metadata Search: Search CrossRef’s fifty million-plus metadata records. Cite search results.  Add results to your ORCID profile. Use the API to resolve citations to DOIs automatically.
  • InChI Lookup: Show what CrossRef DOIs mention a specific International Chemical Identifier (InChI). See which InChIs are mentioned by a CrossRef DOI.
  • OpenSearch Description File: Add CrossRef Metadata Search to your browser’s search bar.
  • QR Code Generator: Given a DOI, generate a QR code that includes the basic metadata for that DOI.
  • pmid2doi: API to lookup DOI for a PMID or the other way around.
  • pdfmark:  Open source command line tool to allow you to add CrossRef metadata to a PDF.
  • pdfstamp: Open source command line tool to automate the application of linked images to PDFs.
  • Family Name Detector: API to determine whether a word is likely to be a family name. Based on all the surnames listed in CrossRef’s 50+ million records. You can also download a list of all the distinct surnames listed in CrossRef metadata.
  • Reverse Domain Lookup: API to check if a domain name is likely to belong to a CrossRef member (e.g. a scholarly publisher).
  • Citation Formatting Service: API. Given a CrossRef DOI, return a citation formatted to a specified style-sheet (e.g. APA, Chicago, MLA).
  • PDF-Extract: Open source command-line too to let you extract references and other metadata from PDFs.
  • Randoim: API that will return you X random CrossRef DOIs. Allows sub-selections. Great tool for testing applications that make us of CrossRef DOIs.
  • PatentCite: See what patents cite a given CrossRef DOI.


Quick & Dirty Guides


retired and/or graduated