This thesis explores the potential of citizen science in the context of researching, preserving, and popularizing Glagolitic heritage through crowd-supported campaigns conducted at the Center for Glagolitic Studies at the University of Zadar, as part of the project Public Science in the Field of Glagolitic Studies: From Crowdsourcing to Knowledge. The aim of this work is to describe the organization of crowd-supported campaigns focused on Glagolitic manuscripts and archives. This description includes determining the appropriate digital infrastructure for conducting transcription activities on Glagolitic manuscripts and establishing a method for selecting a suitable corpus for the crowd-supported campaign to ensure its success. Furthermore, the goal is to assess the usefulness and benefits of such campaigns for the public, as well as for archives and other heritage institutions. The research method is a case study based on three campaigns conducted at the Centre for Glagolitic Studies at the University of Zadar in collaboration with the Archdiocese of Zadar Archives and the State Archives in Zadar. Through the GlagoLab digital platform and the use of Transkribus, a tool for automatic recognition, transcription, and search of historical documents, the transcription of Glagolitic manuscripts was facilitated. In this way, amateur citizens were engaged in scientific research as equal participants, demonstrating the practice of citizen science. The results of the campaigns indicated high interest and engagement from the local public, enabling the transcription of over 200 pages of Glagolitic manuscripts. The organization of the crowd-supported campaigns is described, as well as their benefits for the public and heritage institutions. It was found that amateur participants gained a range of educational benefits and developed new research and technical skills, while archives and heritage institutions benefited through increased visibility, support in regular activities, and the improvement of existing services