BioPortal Help


Welcome to the National Center for Biomedical Ontology’s BioPortal. BioPortal is a Web-based application for accessing and sharing biomedical ontologies.

Getting Started

BioPortal allows users to browse, upload, download, search, comment on, and create mappings for ontologies.

Browse The Library

Users can browse and explore individual ontologies by navigating either a tree structure or an animated graphical view. Users can also view mappings and ontology metadata, and download ontologies.

Additionally, users who are signed in may also submit a new ontology to the library. All submissions to the library are reviewed.

Web services

Documentation and examples of the BioPortal 2.0 Web services.

Announce List

To receive notices of new BioPortal releases or site outages, please email

How to Cite BioPortal

Noy, N.F., Shah, N.H., Whetzel, P.L., Dai, B., Dorf, M., Griffith, N., Jonquet, C., Rubin, D.L., Storey, M.A., Chute, C.G., Musen, M.A. BioPortal: ontologies and integrated data resources at the click of a mouse. Nucleic Acids Res. 2009 Jul 1;37(Web Server issue):W170-3. PMID: 19483092. doi:10.1093/nar/gkp440