The Graphikportal – Europe’s first union online catalogue especially designed for drawings and prints. The art historical database developed at the German Documentation Centre for Art History – Bildarchiv Foto Marburg, provides a large online pool of works of art of the European cultural heritage. At the start, around 300,000 works of art from 24 European collections are online, including the prints and drawings departments of the Staatliche Museen zu Berlin – Preußischer Kulturbesitz, the Staatliche Kunstsammlungen Dresden and the Hamburger Kunsthalle. The Albertina and the MAK Bibliothek und Kunstblättersammlung in Vienna, the Graphische Sammlung of the ETH Zurich and the Zentralbibliothek Zürich or the Bibliotheca Hertziana – Max Planck Institute for the History of Art in Rome are also present. Last but not least, the collections of the Virtuelles Kupferstichkabinett, a cooperation between the Herzog Anton Ulrich Museum and the Herzog August Bibliothek Wolfenbüttel, will be integrated as well. For the first time across collections the new Graphikportal makes these hidden treasures of the European cultural heritage accessible to a wider public on the Internet. All these institutions are members of the international working group «Graphik vernetzt» (Graphics networked), which aims to agree on common digitization standards and designing strategies for the further digital networking of graphic collections. This digital networking offers a real scientific added value, which can be used for the first time in the graphics portal on this scale. For example, all proofs deriving from the same plate or block are brought together in one search result.