Virtual laboratory is useful as an alternative to real laboratory where virtual laboratory can provide facilities that are not available in real laboratory and help prepare students for real experiences in real laboratory. This study aimed to determine the validity of the Filasik virtual laboratory media. The research model used is the ADDIE development model (analysis, design, development, implementation, and evaluation) and the phases carried out up to the development phase. In the analysis phase, a needs analysis was carried out which consists of the needs of students and laboratory facilities. In the design phase, product design was carried out using HTML5