Abstract — The development of digital technology provides new opportunities in efforts to preserve local culture, including traditional Indonesian mask culture. This study aims to develop a web-based Augmented Reality (AR) application as a medium for education and preservation of Nusantara mask culture. The system was developed using the Research and Development (R&D) method with a Software Development Life Cycle (SDLC) Waterfall model approach that includes the stages of planning, needs analysis, design, implementation, testing, and maintenance. The application is implemented on a web platform using MyWebAR technology, featuring a face tracking feature that displays virtual mask objects in real-time. A total of 10 types of Indonesian cultural masks are implemented in the system, namely Dayak, Dewi Ragil Kuning, Dewi Sekar Taji, Gunung Sari, Kelana, Panji, Punakawan, Rumyang, Sidakarya, and Tumenggung. The system utilizes 68 facial landmark points as a tracking feature to adjust the position of the mask to the user's face. The results of black box testing show that 100% of the system features run according to the designed function. In addition, usability testing using the System Usability Scale (SUS) obtained an average score of 84.5, which is included in the Excellent category and indicates a high level of user acceptance. The research results show that the application is capable of being an interactive educational media that supports the preservation of Indonesian mask culture through the use of Augmented Reality technology. Keywords: augmented reality; cultural preservation; Indonesian culture; traditional masks; virtual try-on