The aim of this paper is to create an online informatics elementary school dictionary that contains informatics terms from textbooks (5th to 8th grade of elementary school) and their translations equivalent in English. The paper consists of a theoretical and a practical part. The theoretical part shows the application of information and communication technologies in education and lists the goals of the subject of Informatics in schools, as well as the domains that are covered in teaching. In addition to the textbook, other educational materials are described. An analysis of IT terms in IT textbooks was conducted and it was established that in addition to most of the new Croatian terms, there is no English translation equivalent in the textbooks. Students have access to some additional digital educational content in Croatian, but there is a greater choice in English. A practical review of the existing online and printed dictionaries, lexicons and encyclopedias of computer terminology, that can represent additional educational material in learning, has determined the predominance of dictionaries with initial English terminology. In addition, it was found that machine translations are not accurate. Knowledge of both the Croatian version and the English equivalent would provide wider possibilities for the use of software tools and digital content. An online elementary school computer dictionary was created as a software solution,. The dictionary contains Croatian terms from textbooks and their precise English translation equivalents, thus representing additional digital educational content.