Free online 3D viewer for STL, OBJ, PLY, STEP and IGES files. Triangulate STEP/IGES CAD and export to STL, OBJ or PLY. Run automated mesh analysis — detect non-manifold edges, open holes, flipped faces and self-intersections. Wall-thickness heat map and automatic print-orientation optimization for 3D printing. View FBX, GLTF, GLB animations. No install. No upload. 100% in your browser.