Pinax is a searchable index of open museum collections, bringing artworks and cultural objects from 11 institutions into one place. Its catalog contains more than 814,000 works, with each result linked to its source and accompanied by rights information. Users can explore the collections through keyword searches, searches by meaning, or image-based search by uploading a picture. Filters help narrow results by institution, license, department, color, and year.

The catalog spans a wide range of material, including paintings, prints, photographs, sculpture, decorative arts, historical objects, and archival items. Participating sources include the Rijksmuseum, the Metropolitan Museum of Art, the New York Public Library, the J. Paul Getty Museum, and the Smithsonian, alongside other museums and collections. Pinax highlights works available under licenses and designations such as CC0, Creative Commons Attribution, public domain, and U.S. public domain, and provides the stated rights information for each item. The service is built and maintained by Resistance Labs and combines discovery tools with downloadable collection records for people seeking art they can legally use.