glTF vs USDZ
glTF and USDZ are the two modern open delivery formats. glTF, from the Khronos Group, is the default for the web, Android and most engines. USDZ, built on Pixar's USD, is the default for Apple's AR and is gaining ground in visualisation pipelines. Many teams author once and export both, keeping glTF as the master for web and USDZ for iOS AR.
Side by side
| glTF | USDZ | |
|---|---|---|
| Full name | GL Transmission Format (JSON) | Universal Scene Description, zipped |
| Created by | Khronos Group | Pixar's USD, packaged by Apple and Pixar |
| Introduced | 2017 (glTF 2.0) | 2018 |
| Encoding | JSON plus .bin and image files (or embedded data) | uncompressed ZIP of USD files and textures |
| File size | about a third larger than GLB when data is embedded | medium |
| Materials | Yes | Yes |
| Textures | Yes | Yes |
| Animation | Yes | Yes |
| Colour | PBR materials; textures embedded as data URIs in our export | PBR materials and embedded textures |
| Units | metres by convention | metres in our export |
| Best for | debugging and hand-editing scene data | iPhone and iPad AR Quick Look and Apple Vision Pro |
Choose glTF when
- •The model is going to the web, Android or a game engine.
- •You want to inspect or edit the scene as JSON.
- •You need broad viewer support.
Choose USDZ when
- •The model is for AR Quick Look on Apple devices.
- •Your studio pipeline is USD-based.
- •You want a single packaged file for Apple tools.
Which apps open them
Of the 15 3D apps in our software guides, 7 open glTF without conversion and 4 open USDZ. Only glTF opens directly in Unity, Godot, Roblox Studio, Sketchfab. Only USDZ opens directly in Maya.
Questions
- Is glTF better than USDZ?
- Neither is better everywhere. The model is going to the web, Android or a game engine: choose glTF. The model is for AR Quick Look on Apple devices: choose USDZ.
- Can I convert glTF to USDZ?
- Yes. Our glTF to USDZ converter runs in your browser. The shape and supported materials carry over.
- Which file is smaller, glTF or USDZ?
- glTF: about a third larger than GLB when data is embedded. USDZ: medium. Actual size depends mostly on polygon count and texture resolution.
Written with AI assistance by the Renderlyst team in October 2026. Format support reflects each app's current release as we understand it, and we link the official documentation so you can confirm it for your version. Spotted something out of date? Email alishbakhalid766@gmail.com.