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Updated August 2026
JSON in. One binary out.
This is the pack step. A self-contained .gltf becomes a .glb you can email or drop on the GLB viewer. If the exporter wrote a folder of .bin and PNGs, this page cannot chase those files. Re-export packed, or open a .glb that already exists.
Source glTF, target GLB. Drop a packed .gltf. Download one .glb.
1
Source is glTF. The File API reads it in this tab. Nothing is posted. Keep it under 80 MB.
2
Buffers are packed into GLB. This is not a remesh.
3
Share the .glb or open it in the GLB viewer.
This page is only glTF → GLB. Other pairs have their own keep and lose notes so they do not repeat this conversion.
| On this conversion | What happens |
|---|---|
| Keeps | The same scene, in one file. |
| Drops | Editable JSON. You gain a shareable binary. |
| Next step | View the GLB, or convert GLB to OBJ/STL if the next tool is desktop or print. |
| Attribute | Result on the reference scene |
|---|---|
| Separate objects | Kept as 2 |
| UV coordinates | Kept |
| Vertex colour | Kept |
| Material names | Kept |
| Vertices on the reference scene | 48 of 48 |
| Mesh | Source | GLB | Change | Vertices written |
|---|---|---|---|---|
| mug.glb | 880 KB | 1,173 KB | 1.3x | 25,000 |
| lion.glb | 8,768 KB | 11,690 KB | 1.3x | 249,369 |
glTF as the source: Materials and textures stay when the source has them. Measured 2026-08-27 by running this converter’s own loaders and exporters headlessly. How every format was measured.
glTF is parsed with the File API. GLB is written in memory. Editable JSON. You gain a shareable binary. That is a format rule, not an upload. Files over 80 MB are refused because RAM is the limit.
This is the pack step. A self-contained .gltf becomes a .glb you can email or drop on the GLB viewer. If the exporter wrote a folder of .bin and PNGs, this page cannot chase those files. Re-export packed, or open a .glb that already exists.
Source glTF, target GLB. Drop a packed .gltf. Download one .glb. No Blender and no account.
When you need one file for web, AR, email, or Generate-style interchange. Keep JSON only while you are editing buffers by hand.
Split exports with a sidecar .bin are not fetched. Export a self-contained glTF or a GLB from the DCC, then convert.
No. glTF is parsed here and GLB is written in memory. There is no convert API.
Yes. Open the glTF viewer if you only need to orbit. Convert when the next tool actually wants GLB.
View the GLB, or convert GLB to OBJ/STL if the next tool is desktop or print.