This paper presents the 3DTiler tool, which supports the manual georeferencing of 3D building models in .glTF or .glb format. Through a browser based interface, users can upload their 3D models and interactively position them on a 3D globe by setting geographic coordinates, elevation, and rotation. The tool then generates a 3D Tile Tileset, which can be used to integrate the models into OGC 3D Tiles-based platforms. The paper outlines how 3DTiler is designed as a lightweight, client-side WebGIS application that facilitates accurate model placement without requiring a backend server or cloud processing. It is part of the University of Cologne’s broader efforts in projects like CampusGIS2 and Virtual Campus to build immersive 3D and XR applications. The tool will be made open source and hosted on university infrastructure.