glTF Binary 3D Model — Binary glTF format for efficient 3D asset delivery.
Quick facts
What is .glb
A .glb file is a glTF Binary 3D Model — Binary glTF format for efficient 3D asset delivery.
In the mime-db registry it maps to model/gltf-binary, and it is marked as compressible. When serving .glb over HTTP, set the Content-Type header as shown in Developer info below.
Related entities: it maps to model/gltf-binary — and is delivered over HTTP via the Content-Type header.
How to open .glb files
Developer info
When served over HTTP, responses should set the following header:
Content-Type: model/gltf-binary
Common software that reads/writes .glb:
Relation chain
Related extensions
Related MIME types
Common uses
How to edit .glb files
How to create .glb files
Frequently asked questions
Common options include Blender, three.js, Windows 3D Viewer. You can also open many of these files with built-in viewers or a browser.
Create a new file in any text editor or the app that owns the format and save it with the .glb extension.
model/gltf-binary is the media type identifier used for .glb files during network transfer (for example in the HTTP Content-Type header).
Sources & standards
Updated 2026-08-18
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