USDZ → GLB

USDZ to GLB, for Android and the web

Zlim converts Apple's USDZ (the AR Quick Look package) to an optimized GLB, the format Android Scene Viewer, model-viewer, and WebAR use — so one source asset can ship to iOS, Android, and the web.

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Why convert USDZ to GLB?

USDZ is Apple's zipped USD package for AR Quick Look on iOS. It does not load in Android Scene Viewer, the web's <model-viewer>, or most game engines, which all expect GLB.

Converting USDZ to GLB lets you author once and deliver everywhere: GLB for Android and web, USDZ for iOS — from the same pipeline.

What Zlim optimizes

Zlim unpacks the USDZ archive, resolves the USD stage, and emits an optimized GLB: geometry is quantized and Draco-compressed, textures are transcoded to KTX2 and mipmapped, and meshes are merged to keep draw calls low. AR runs on mobile GPUs, so the texture-memory and draw-call savings matter as much as file size.

bash

zlim optimize model.usdz -o model.glb -p balanced   # AR-ready for Android + web

FAQ

Do I still need a USDZ for iOS?

iOS AR Quick Look uses USDZ. Zlim also reads USD/USDZ, so you can keep USDZ for iOS and generate the optimized GLB for Android and the web from the same source.

Are PBR materials preserved?

Yes — USD Preview Surface materials map to glTF PBR, and textures are carried into the GLB and compressed to KTX2.

Convert USDZ to GLB now

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