This video is a screencast of the ground truth annotation web tool developed in the 3D-PITOTI project. It features the segmentation of single figures in large 2D-tracings and their annotation according to multiple typologies. Multi-user functionality and multi-annotation of uncertain figures increase data confidence. It is easily accessible with a modern web browser and the data is stored centrally on a server. Together with figure grouping function, statistical reports and multiple export formats it is a tool with high potential for use in future research.