Potree is an open source project that implements point cloud rendering capability in a browser. It is a WebGL based point cloud viewer for large datasets. Thanks to WebGL, it runs in all major browsers without plugins. This presentation will give an overview over the current state of point cloud rendering with WebGL, about the difficulties and challenges. Laser data is expected to play an increasing role in the next years with falling prices for previously very expensive hardware, the development of autonomous vehicles and the popularity of drones. Powerful hardware and WebGL will open up a wide range of innovative browser-based web services in the near future.