This study investigates the reasons behind pre-service and in-service teachers’ decisions to use digital literacy tools in their teaching following the COVID-19 pandemic. The objective is to understand the factors influencing their choices and to identify areas where support and training are needed. Semi-structured interviews were conducted with eight teachers from a university demonstration school in Thailand, evenly divided between pre-service and in-service teachers. The Technology Acceptance Model (TAM) framework guided the creation and adaptation of the interview questions. The findings indicate that pre-service teachers prefer digital tools that are easy to use, accessible, and affordable, with features such as templates, multimedia, and engaging functionalities. In contrast, in-service teachers prioritize familiar tools that save time and enhance the quality of teaching materials. Both groups value tools that facilitate collaboration and ensure privacy. The study highlights the significant generational differences in technology adoption, with younger teachers showing a greater inclination towards exploring a variety of digital tools, while more experienced teachers tending to stick with familiar technologies due to time constraints and comfort levels. These insights underscore the necessity for ongoing, tailored professional development programs that address the specific needs of both pre-service and in-service teachers. Such programs should focus on enhancing digital literacy, providing practical examples of new tools’ benefits, and fostering a supportive community for technology integration. By understanding these differences, educational institutions can better support teachers in integrating digital literacy tools effectively, thereby improving teaching practices and professional development opportunities. The implications of this study suggest that a one-size-fits-all approach to technology training may not be effective, and differentiated support is essential to cater to the diverse needs of educators.