This paper presents the development, implementation and evaluation of an online tool for personalized mobile learning of engineering graphics. The online tool is designed to support the widespread mobile operating systems, such as Android, iOS, Windows 10 Mobile, as well as to be interactive and to enable "learning by doing''. The framework for the developed tool includes Dropbox, as the file storage application, and AutoCAD 360, as an interactive CAD application with various tools for drawing. The study was conducted on a sample of 30 undergraduate students. The students were divided into the experimental group, using the developed online tool for personalized mobile learning, and the control group, using traditional learning tools. A statistical analysis of both samples was carried out in order to study the effectiveness of this online tool in the learning process. The results of the final test showed that the students from the experimental group were more successful than the students from the control group. Therefore, the use of the developed online tool for personalized mobile learning of engineering graphics can be considered an improvement in the teaching of engineering graphics.