The creation of a multimillion card index of the Old Church Slavonic language, intended for linguistic research of the Prague group of the Old Church Slavonic dictionary, was carried out manually for several decades. The purpose of this work is to include linguistic data on paper cards in computer form. The task is not only to transfer linguistic data (lemma, forms, Greek correspondence and translation) but to make available the information contained in a card and to provide a reverse reconstruction of the OCS texts from which extracts were given.