The purpose of the article is to substantiate the transformation of information resources of public libraries of Ukraine in modern conditions.
 The methodological basis of the article was based on systemic, information-service and modernist approaches and the application of the principles of objectivity and comprehensiveness of knowledge. The organic combination of structural-functional analysis, synthesis, and cognitive methods made it possible to successfully realize the set goal.
 The scientific novelty consists in considering the main aspects of the formation of electronic information resources against the background of the aggression of the Russian Federation against the sovereign state of Ukraine, starting in 2014, arguing that public libraries actively participated in the information processes of creating a regional source base on events that take place in modern history of our state. The existing ones are analyzed and the author's understanding of the term "electronic library and information resources" is proposed.
 Conclusions. Digitization stimulates the general trend of transformation of public libraries of Ukraine into hubs for comprehensive processing of all types of information on all media. The use of new media in library practice contributes to the production of relevant electronic information resources, which marks the third stage of the use of information and communication technologies in the work of libraries. The public libraries of Ukraine currently have the following types of electronic information resources: a) electronic catalogs; b) full-text databases; c) electronic collections of text analogues of printed publications; d) collections of digitized publications; e) electronic documents that do not have printed counterparts; f) electronic publications of audio and video information; g) multimedia products. Electronic information resources enrich the assortment and include the following audiovisual products: audio recordings, films, videos, slides, presentations, etc., including exhibitions and tours of the library, advertising of new arrivals, online meetings with famous people or solutions to current community issues, etc. Own accounts in social networks (Facebook, Twitter, Pinterest, Instagram), messengers (WhatsApp, Telegram, Viber), video hosting (YouTube), on the one hand, have a significant potential for popularizing the library, on the other hand, are a platform for approving the demand for created electronic information resources.