The National Archives of Hungary, with the assistance of Arcanum Adatbázis Kft, published on its website the photos and descriptions of all the pre-1526 charters related to the Kingdom of Hungary. Our archives also participated in this job, although some of our minor amendment proposals have not been introduced into the database yet.

This Collectio Diplomatica Hungarica database is available here, furthermore among the databases of the Hungaricana public collection portal.