36 free 3D tools that run entirely in the browser, with nothing uploaded: files are processed on your own device with WebGL and WebAssembly. View STL, OBJ, GLB, 3MF, FBX and USDZ with real-millimeter measurements, convert between formats, repair and simplify meshes, and generate print-ready parts from a few numbers: Gridfinity bins, boxes with lids, hose adapters, keychains, lithophanes and star maps. No account, no watermark, no upload limits.