This paper introduces web viewers for educational VR contents. Recently, many types of VR goggles have been released as commercial products and many entertainment applications for them have been created. However, educational VR contents have been created so far are not so many because the creation of VR contents is time consuming task. We need to create many educational VR contents to enhance educational efficiency using VR technology. On the other hand, many types of scanning devices have been researched and developed, e.g., Lidar cameras, 360VR cameras and so on. Using these scanning devices, we can obtain 3D data like Point Cloud Data (PCD), 3D model data, 360VR images/videos. To use these 3D data as educational VR contents, we need viewer applications for them. In this paper, the authors propose such viewer applications as web services. The proposed web viewers also have functionality to upload 3D data from users' web-browser to the web-server on that the web viewers are stored. Therefore, it becomes possible for users like teachers to provide other users like students with educational VR contents as web contents. In addition, as the proposed web viewers support VR goggles, they provide students with immersive environments. [For the full proceedings, see ED639391.]