Access to the Internet and digital technologies has become the primary source of information used in academic papers, and, according to numerous studies, is therefore accountable for the greatest number of cases of cyber-plagiarism. The aim of this study is to determine whether the type of format used by university students for their academic papers (paper/electronic) has an influence on plagiarism or cyber-plagiarism. The research is based on a quantitative methodology, and it is characterized as exploratory, descriptive, and explanatory, using the questionnaire as a tool for data collection. Purposive non-probability convenience sampling provided a sample of 8,943 students from the Autonomous Community of Galicia. The findings show a preference for the use of the electronic format for submitting academic work. Exceptions are made in several cases in which statistically significant differences are observed both in the acts of plagiarism that are initiated and in the main reasons given to justify such acts. A discussion of the findings correlates the findings of the research with the analysis of previous studies in this area, and the conclusions focus on the need to train students in informational skills so as not to commit plagiarism when using the Internet as an academic source.