# What is a GLB file?

> A GLB file (.glb) is the binary, single-file version of glTF 2.0, the 3D format standardised by the Khronos Group in 2017. One GLB holds a scene's meshes, PBR materials, textures and animations, so it is compact, quick to load and the default for web 3D viewers, AR, game engines and AI 3D generators.

URL: https://kenerateai.com/what-is-a-glb-file
Publisher: Kenerate AI (https://kenerateai.com)
Last updated: 2026-10-02

## Key facts
- Full name: glTF 2.0 Binary
- Made by: Khronos Group (glTF 2.0, 2017)
- Holds: Meshes, PBR materials, textures, animation
- Units / axis: Metres, Y-up
- Opens in: Browsers, Blender, Windows 3D Viewer, Unity, Unreal, Godot
- Convert to: STL for 3D printing · USDZ for iPhone AR

## In depth

### What's inside a GLB
glTF describes a 3D scene as JSON plus binary data: vertex positions, normals and UVs for the meshes, material settings, and images for textures [1][2]. A .gltf file keeps these as separate files; a .glb packs the JSON and all binary data into one file [2].
- Meshes — the triangles that make up the shape
- PBR materials — base colour, metalness, roughness, normal, occlusion, emissive [2]
- Textures — the images those materials use, embedded
- Scene graph — nodes, transforms, cameras
- Animation and skins — rigged characters and keyframes

### GLB vs glTF
Files — One binary file — A JSON file plus .bin and image files
Best for — Sharing, downloading, uploading — Editing by hand, debugging
Size — Compact — Larger if images are base64-embedded
Content — Same glTF 2.0 data — Same glTF 2.0 data

### Why GLB is everywhere
glTF was designed to be loaded straight onto the GPU with little processing, which is why Khronos calls it the “JPEG of 3D” [1]. It's an open, royalty-free standard, supported by three.js and other web engines, Blender, Unity, Unreal and Godot. Most AI 3D engines — including all nine in the Kenerate 3D Studio — return GLB.

### Units and orientation
glTF uses metres and a right-handed, Y-up coordinate system [2]. 3D printers and CAD tools usually work Z-up in millimetres, so when you convert a GLB to STL for printing, set the size in mm and turn it Z-up — the free converter does both.

### How to open a GLB file
- In a browser: the free GLB viewer (no install).
- Blender: File → Import → glTF 2.0 (.glb/.gltf).
- Windows: 3D Viewer opens .glb files.
- Game engines: Godot imports GLB natively; Unity and Unreal import glTF/GLB with their glTF importers.
- iPhone / iPad: convert to USDZ for AR Quick Look.

### Converting GLB
STL — 3D printing — Textures, colours, animation
3MF — 3D printing with units — Textures and animation
OBJ — Older 3D apps — PBR materials, animation
USDZ — AR on Apple devices — Animation (in our converter)

References:
[1] Khronos Group — glTF overview: https://www.khronos.org/gltf/
[2] Khronos Group — glTF 2.0 specification: https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html

## FAQ
Q: What does GLB stand for?
A: GL Transmission Format Binary — the binary container for glTF 2.0.

Q: Is GLB the same as glTF?
A: Same data, different packaging: .glb is one binary file, .gltf is JSON plus separate files.

Q: How do I open a GLB file?
A: Drop it into a GLB viewer in your browser, or open it in Blender, Windows 3D Viewer or a game engine.

Q: Can Blender open GLB files?
A: Yes. Use File → Import → glTF 2.0 (.glb/.gltf); meshes, PBR materials, textures and animation come in together. Blender also converts glTF's Y-up axes to its own Z-up on import. To export one, use File → Export → glTF 2.0 and pick the binary .glb option.

Q: Can I 3D print a GLB file?
A: Convert it to STL or 3MF first, set the size in millimetres and check thin parts.

Q: Does GLB support animation?
A: Yes — glTF supports skins and keyframe animation.

Q: Is GLB free to use?
A: Yes. glTF is an open, royalty-free standard from the Khronos Group.

## Related pages
- GLB viewer: https://kenerateai.com/glb-viewer
- GLB to STL: https://kenerateai.com/glb-to-stl
- GLB to USDZ: https://kenerateai.com/glb-to-usdz
- What is an STL file?: https://kenerateai.com/what-is-an-stl-file

## Sources
- Khronos Group — glTF overview: https://www.khronos.org/gltf/
- Khronos Group — glTF 2.0 specification: https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html