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Updated August 2026
FBX in. glTF JSON out.
Same exit family as FBX to GLB. Prefer the binary for sharing. Use JSON only if a tool names .gltf. FBX still cannot be written from this browser.
Source FBX, target glTF, drop, download JSON.
1
Source is FBX. The File API reads it in this tab. Nothing is posted. Keep it under 80 MB.
2
glTF JSON from the loaded FBX graph.
3
Share as GLB if a single file is easier.
This page is only FBX → glTF. Other pairs have their own keep and lose notes so they do not repeat this conversion.
| On this conversion | What happens |
|---|---|
| Keeps | What the loader kept, as JSON. |
| Drops | A round trip to FBX. Prefer GLB for one file. |
| Next step | Pack to GLB, or keep JSON for a glTF-only tool. |
| 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 | glTF | Change | Vertices written |
|---|---|---|---|---|
| mug.glb | 880 KB | 1,564 KB | 1.8x | 25,000 |
| lion.glb | 8,768 KB | 15,587 KB | 1.8x | 249,369 |
FBX as the source: Imported here, then written as the target. FBX itself is not written. Measured 2026-08-27 by running this converter’s own loaders and exporters headlessly. How every format was measured.
FBX is parsed with the File API. glTF is written in memory. A round trip to FBX. Prefer GLB for one file. That is a format rule, not an upload. Files over 80 MB are refused because RAM is the limit.
Same exit family as FBX to GLB. Prefer the binary for sharing. Use JSON only if a tool names .gltf. FBX still cannot be written from this browser.
Source FBX, target glTF, drop, download JSON. No Blender and no account.
GLB for one file. glTF JSON only when the next tool requires it.
No. It is an on-device pack of what the browser already opened.
No. FBX is parsed here and glTF is written in memory. There is no convert API.
Yes. Open the FBX viewer if you only need to orbit. Convert when the next tool actually wants glTF.
Pack to GLB, or keep JSON for a glTF-only tool.