Free 3D file viewer. No install. No account. No limits.
GeometryViewer is a browser-based 3D file viewer that lets you open STL, OBJ, GLB, GLTF, 3MF, and FBX files instantly — on any device, in any browser. Drag a file in, and it renders in 3D. On mobile, tap to view it in augmented reality at real-world scale. No software to install, no account to create, and your files never leave your device.
We built GeometryViewer because viewing a 3D file should not require installing a 500 MB application. Whether you are a mechanical engineer checking a STEP export, a maker previewing a Thingiverse download before printing, or a designer sharing a concept with a client — you need a viewer that opens instantly and gets out of the way.
Web developer and 3D printing maker. Josh built GeometryViewer's rendering engine, 3D file parser, and AR pipeline. He has tested the viewer against 250,000 real-world STL files from Thingiverse, Printables, and MyMiniFactory to ensure it handles everything the community throws at it.
Retired civil engineer with 25+ years in commercial construction. Christopher founded GeometryViewer and ModelDirectory.org to make 3D files more accessible. Author of 3D Printing Artificial Coral Reefs (Amazon). Former PADI dive instructor.
ModelDirectory.org is our 3D model search engine — 246,000+ models aggregated from Thingiverse, Printables, MyMiniFactory, and Sketchfab. Every model is SHA-256 fingerprinted for provenance. GeometryViewer powers the 3D preview and rendering across the entire directory.
Your files never leave your device. GeometryViewer's parser and renderer run entirely in your browser using WebGL. There is no upload step, no server processing, and no data collection. Even if you disconnect from the internet after loading the page, the viewer continues to work. Read our full privacy policy.
Questions, feedback, or press inquiries: [email protected]