Authors: Oumayma Bounou ^1,2,3,4,5; Tom Monnier ^6,3,4; Ilaria Pastrolin ⁷; Xi SHEN ; Christine Benevent ^8,2; Marie-Françoise Limon-Bonnet ^9,7; François Bougard ¹⁰; Mathieu Aubry ³; Marc H. Smith ^6,7; Olivier Poncet ^11,7; Pierre-Guillaume Raverdy ^12,5

• 1 Service Expérimentation et Développement [Paris Rocquencourt] [ENC]
• 2 École nationale des chartes
• 3 Laboratoire d'Informatique Gaspard-Monge
• 4 Models of visual object recognition and scene understanding
• 5 Service Expérimentation et Développement [Paris]
• 6 École nationale des chartes [ENC]
• 7 Centre Jean Mabillon
• 8 Centre Jean Mabillon [ENC]
• 9 Archives nationales
• 10 Institut de recherche et d'histoire des textes
• 11 Comité des travaux historiques et scientifiques
• 12 Service Expérimentation et Développement [Paris Rocquencourt]

The study of watermarks is a key step for archivists and historians as it enables them to reveal the origin of paper. Although highly practical, automatic watermark recognition comes with many difficultiesand is still considered an unsolved challenge. Nonetheless, Shen et al. [2019] recently introduced a newapproach for this specific task which showed promising results. Building upon this approach, this workproposes a new public web application dedicated to automatic watermark recognition entitled Filigranespour tous. The application not only hosts a detailed catalog of more than 17k watermarks manually collected from the French National Archives (Minutier central) or extracted from existing online resources(Briquet database), but it also enables non-specialists to identify a watermark from a simple photographin a few seconds. Moreover, additional watermarks can easily be added by the users making the enrichment of the existing catalog possible through crowdsourcing. Our Web application is available athttp://filigranes.inria.fr/.