Crises represent extraordinary situations in which business is not possible or is carried out under restrictive conditions. In 2020, the whole world faced a crisis of pandemic proportions, with the emergence of the coronavirus. The emergence of the pandemic affected all spheres of life, including library operations. In the first part of the paper, various library services are presented, those provided in the library, but also those provided distance. The library, which until then was a place of gathering, providing information and various services, had to close its doors to users due to the coronavirus pandemic, but also to change its way of doing business. By decision of the Civil Protection Headquarters of the Republic of Croatia, libraries closed their doors to users from March 19 to April 24, 2020. Business has moved to the virtual world, and librarians had to quickly devise ways to continue providing services to their users. The research part of the work related to the research conducted among public libraries in the Republic of Croatia. The aim of the research was to investigate which library services the public libraries provided during the complete closure due to the coronavirus pandemic (from March 19 to April 24), which new services were introduced and how the libraries adapted to the new working conditions caused by the pandemic.