3D Viewer & Mesh Checker - STL, OBJ, 3MF, GLB

A fast, private 3D model viewer that runs entirely on your computer. Drop in a file and inspect it before you slice or share it — no upload, no account, no tracking. VIEW 3D FILES INSTANTLY • Supports STL, OBJ, 3MF, GLB and GLTF • Orbit, zoom and pan with smooth controls • Wireframe mode for checking geometry • Correct Z-up orientation for STL/3MF print files MESH CHECKUP FOR 3D PRINTING Every file gets an instant printability report powered by the MeshRefinery mesh engine: • Watertight check (open/boundary edges) • Non-manifold edge detection • Loose fragments / multiple shells • Degenerate (zero-area) faces • Triangle, vertex and part counts, plus model dimensions FIX PROBLEMS IN ONE CLICK Found holes or non-manifold geometry? Jump straight to MeshRefinery's free in-browser repair tool, or convert between formats (STL ⇄ OBJ, GLB → STL/3MF and more) on meshrefinery.com. 100% PRIVATE Your files never leave your computer. The extension requests zero permissions, collects zero data, and works offline. Made by MeshRefinery — free online 3D print file tools. https://meshrefinery.com