Free online GLTF to USDA converter

Source format: glTF

glTF (GL Transmission Format) is a modern 3D asset format designed for efficient transmission and loading of models, materials, textures, and animations. It is widely used in web 3D, game development, AR/VR, product visualization, and real-time rendering pipelines. glTF files are commonly stored as .gltf with external resources, or as binary .glb files that bundle geometry, materials, and textures into one package.

Its main strengths are compact size, fast loading, and broad support across engines and viewers such as Blender, Unity, Unreal Engine, Babylon.js, and Three.js.

Target format: USDA

USDA is the ASCII text form of USD (Universal Scene Description), a scene description format developed by Pixar and used in film, animation, VFX, visualization, and increasingly in real-time 3D workflows. A USDA file is human-readable and can describe complex scenes, including geometry, materials, transforms, variants, and animation.

The main advantages of USDA are editability, readability, and compatibility with the broader USD ecosystem. It is especially useful when you want to inspect or tweak scene data directly in a text editor or integrate assets into USD-based pipelines.

How to perform the conversion

The most reliable way to convert .gltf to .usda is to use Blender, which supports importing glTF and exporting USD formats in recent versions.

1. Open Blender.
2. Import the glTF asset using File → Import → glTF 2.0.
3. Check that the model, materials, and animations loaded correctly.
4. Export to USD ASCII using File → Export → Universal Scene Description.
5. In the export options, choose ASCII or USDA output if available, then save the file with a .usda extension.

If your glTF asset includes external textures or linked resources, keep them in the same relative folder structure during import and export so the USD file can reference them correctly. You can also convert the file on 101convert.com for free, without installing any software.

Notes on quality and compatibility

Geometry usually converts well, but some glTF features may not map perfectly to USDA. Common limitations include differences in material models, texture coordinate handling, animation interpolation, and scene hierarchy conventions. glTF PBR materials may be translated into USD materials with varying fidelity depending on the exporter.

If the source is a .glb file, embedded textures and buffers must be unpacked during conversion, and the resulting USDA may reference external files. For best results, use a recent version of Blender and verify the exported scene in a USD-capable viewer such as usdview or another USD pipeline tool.