USDZ vs. GLB vs. FBX: 3D Format Guide for 2026

Choosing the wrong 3D export format can mean a model that refuses to import, displays with broken materials, or crashes your game engine. This guide cuts through the confusion with practical format advice for real workflows.

Format Overview

GLB (GL Transmission Format Binary)

GLB is the binary container format for GLTF 2.0. It packages the 3D model, textures, materials, and animations into a single binary file. It is the web standard for 3D on the web and is natively supported by most game engines.

Best for: Web 3D (Three.js, Babylon.js, model-viewer), Unity, Godot, general-purpose 3D workflows.

Not ideal for: Apple-specific AR workflows (though GLB does work on iOS with loading libraries).

GLTF 2.0 (GL Transmission Format)

GLTF is the non-binary version — stored as separate .gltf JSON file + .bin + texture images. Same underlying standard as GLB.

Best for: When you need to inspect or manually edit model data, or when working with tools that prefer separate files.

Not ideal for: When a single-file workflow is needed.

USDZ (Universal Scene Description zip)

USDZ is Apple's 3D format for AR Quick Look on iOS and visionOS. It is a zipped package containing a USD (Universal Scene Description) file. USDZ models display directly in AR view on iPhone without any app — just open the file and point your camera.

Best for: Apple AR Quick Look experiences, iOS/macOS visionOS applications, web on Apple devices.

Not ideal for: Non-Apple platforms, game engines (Unity has limited USDZ support, Unreal Engine no native support).

FBX (Filmbox)

FBX is Autodesk's proprietary format with broad industry support. It handles geometry, materials, textures, animations, skeletal data, and lighting. It is the de facto standard for game asset interchange between DCC tools (Maya, Blender, 3ds Max) and game engines.

Best for: Animated characters (rigged meshes), complex material setups, interchange between DCC tools and game engines.

Not ideal for: Web 3D, simple static props, AR Quick Look.

Format Comparison Table

| Feature | GLB/GLTF | USDZ | FBX | |---|---|---|---| | Single file | Yes | Yes | Yes | | Textures embedded | Yes (in binary) | Yes | No (separate files) | | Animations | Yes | Yes | Yes | | Skeletal rig | Yes | Yes | Yes | | Materials/PBR | Yes | Yes | Yes (limited) | | File size | Small | Medium | Large | | Web support | Excellent | Limited (Apple only) | Poor | | Apple AR Quick Look | No (native) | Yes | No | | Unity import | Native | Plugin required | Native | | Unreal Engine import | Native (GLTF) | Limited | Native (FBX) | | Blender import | Native | Via USD plugin | Native | | iOS native display | Via model viewer | Native | Via SceneKit load | | Open source | Yes | No (Apple proprietary) | No |

Practical Format Selection Guide

For Web 3D / Three.js / Babylon.js

Always use GLB. It is the only format with native browser support via WebGL. Most web 3D frameworks have built-in GLB loaders. Example code:

const model = await gltfLoader.load('model.glb');
scene.add(model.scene);

For Apple AR Quick Look

Use USDZ. This is the native format for iOS AR Quick Look. Users can view your 3D model in AR by opening the USDZ file in Safari or Messages. HiPtah exports USDZ directly.

For Game Prototyping in Unity

Use GLB for static props — fastest import workflow. Use FBX for anything with animation or complex rig data.

For Unreal Engine 5

Use GLB/GLTF for static meshes (native importer handles these well). Use FBX for skeletal meshes and animations.

For Blender workflows

Use GLB for web-ready exports. Use FBX for interchange with game engines. USDZ requires the Pixar USD plugin for Blender.

For 3D Printing

Use STL for most FDM printers. OBJ is an alternative. GLB is not typically used for 3D printing workflows.

Common Format Problems and Solutions

GLB imports with missing textures in Unreal Engine

Unreal's GLTF importer does not always import embedded textures correctly. Fix: re-export from the source tool with external texture files rather than embedded, or use FBX instead.

USDZ does not open on Android

USDZ is Apple-only. Android users cannot open USDZ files directly. Solution: provide a GLB alternative or use Google's scene viewer format (GLB with specific extension).

FBX exports from AI tools have wrong scale

AI text-to-3D tools often export FBX at inconsistent scales. Always check import settings in your target application. Common fix: apply a 0.01 or 100 scale multiplier in the import dialog.

GLB file too large for web

Optimize GLB files using gltf-pipeline:

gltf-pipeline -i model.glb -o model_opt.glb --draco

This applies Draco compression which can reduce file size by 80-90% with minimal quality loss.

HiPtah's Format Support

HiPtah exports to all major formats directly from the platform:

• GLB/GLTF: Default recommended format for all game engines and web
• USDZ: Available for Apple AR Quick Look workflows
• FBX: Available for engines preferring FBX (Unity legacy workflows)
• STL: Available for 3D printing workflows
• 3MF: Available for manufacturing and 3D printing

This format breadth means you can generate once in HiPtah and export to whatever format your specific workflow requires — no conversion tools needed.