What Is a GLB File and How Do You Open One?
GLB files are everywhere now: e-commerce product models, AR assets, game mods, 3D scans shared from a phone. If one landed in your inbox, here is what it is and what to do with it.
What a GLB contains
GLB is the single-file binary packaging of glTF 2.0, the Khronos standard for real-time 3D. One file bundles geometry (stored ready for the GPU), PBR materials, textures, animations and the scene hierarchy. It is deliberately optimized for loading fast — the reason it is called “the JPEG of 3D”.
Opening a GLB
No install needed: drop it into the free online GLB viewer — it renders the model with its scene tree, supports Draco-compressed geometry, and never uploads the file. Blender, Windows 3D Viewer and three.js-based tools open GLB too.
Converting to and from GLB
- To GLB: STEP to GLB for CAD parts headed to the web, FBX to GLB and COLLADA to GLB for legacy game assets, OBJ to GLB for plain meshes.
- From GLB: GLB to STL to print a downloaded model, or GLB to OBJ for older tools.
For a deeper comparison of web formats, read glTF vs GLB vs OBJ.