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Pack a multi-file glTF scene (JSON + `.bin` + textures) into a single binary GLB for easy distribution. The scene graph, PBR materials, animations, and skins are preserved.
By ChangeThisFile Team · Last updated: March 2026
ChangeThisFile converts glTF to GLB by packing the JSON scene description, `.bin` buffer data, and referenced textures into a single binary container — the official Khronos GLB format. The scene graph, PBR materials, animations, skins, and morph targets are preserved. Powered by Assimp on the server. Free, encrypted upload, files auto-deleted after conversion.
glTF vs GLB (Binary glTF): Format Comparison
Key differences between the two formats
| Feature | glTF | GLB |
|---|---|---|
| Container | JSON + external .bin + textures | Single binary file |
| File count | Multiple | 1 |
| Distribution | Bundle / zip | One-file delivery |
| Loading | Multi-fetch (or zip) | Single fetch |
| Web suitability | Multiple HTTP requests | Single HTTP request (preferred for web) |
| Spec | Khronos glTF 2.0 JSON | Khronos glTF 2.0 binary container |
| Editing | Direct JSON edit | Requires unpack-and-repack |
When to Convert
Common scenarios where this conversion is useful
Shipping models to a web viewer
GLB is the preferred web delivery format because it's a single HTTP fetch. Three.js, Babylon, `<model-viewer>`, and Unity all accept GLB directly.
Distributing models to non-technical users
A `.glb` file is one drag-and-drop. A glTF bundle with `.gltf`, `.bin`, and textures is easy to break by losing a file.
Embedding in apps and games
Most engines and runtimes load GLB faster than glTF because there's no per-asset roundtrip — everything is in the container.
Re-packing after manual edits
Edit a glTF JSON, swap a texture, then re-pack to GLB before shipping. Round-trips cleanly through Assimp.
Who Uses This Conversion
Tailored guidance for different workflows
3D Artists
- Convert glTF models to GLB (Binary glTF) for importing into the 3D tool or engine you work in
- Hand off glTF assets as GLB (Binary glTF) to collaborators on a different 3D pipeline
Game & AR/VR Developers
- Convert glTF assets to GLB (Binary glTF) for a game engine or AR/VR runtime that expects GLB (Binary glTF)
- Prepare glTF scenes as GLB (Binary glTF) for real-time rendering on the web or a headset
Product & 3D-Print Designers
- Convert glTF designs to GLB (Binary glTF) for previewing, sharing, or preparing a print
- Turn a glTF CAD or sculpt export into GLB (Binary glTF) for a slicer or web viewer
How to Convert glTF to GLB (Binary glTF)
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1
Upload your glTF bundle
Drop your `.gltf` JSON file. If your scene references external buffers and textures, zip them together with the `.gltf` first and upload the zip. Up to 50MB total.
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2
Server-side packing
Assimp reads the glTF, resolves external buffer and texture references, and packs everything into a single GLB binary container with the JSON header, BIN chunk, and embedded images.
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3
Download the GLB file
Your `.glb` file is delivered as a download. Uploaded files are deleted from disk immediately after the response.
Developers: convert via API →
Frequently Asked Questions
If your `.gltf` references external `.bin` and texture files, zip the whole bundle together. If your glTF already has buffers and images embedded as data URIs, you can upload the single `.gltf` directly.
For standard glTF 2.0 scenes, yes — round-tripping glTF → GLB → glTF preserves the scene graph, materials, animations, and skins. Some `KHR_*` and `EXT_*` extensions pass through but aren't deeply validated; verify any extension you rely on.
Yes. All referenced PNG/JPEG textures are pulled into the GLB's BIN chunk and indexed from the embedded JSON. No external image files needed at runtime.
Yes. The PBR metallic-roughness workflow is the glTF 2.0 core spec, fully preserved. Base color, metallic-roughness, normal, occlusion, and emissive maps round-trip. `KHR_materials_unlit`, `KHR_materials_clearcoat`, and similar pass through.
All preserved. Animation channels, skin matrices, morph target weights — everything that's in the standard glTF 2.0 spec round-trips through GLB packing.
Assimp is a large native library; a browser-only build would mean a multi-megabyte WASM download. Server-side keeps the page fast and the importer current.
50MB total upload on the anonymous endpoint, 5 requests per minute per IP. Use the authenticated /v1/convert API for larger files.
Yes. HTTPS upload, ephemeral temp directory, files deleted immediately after the conversion response. Contents are not logged.
GLB for distribution (one fetch, no broken references). glTF for development (text-editable, diffable, asset-swap-friendly). Most teams author in glTF and ship GLB.
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