GLBDeskAvailable conversions
| Conversion | What the output contains | Key limit |
|---|---|---|
| glTF → GLB | A self-contained GLB | Supported glTF 2.0 core and two extensions |
| GLB → glTF | glTF, BIN and textures in a ZIP | Supported glTF 2.0 core and two extensions |
| OBJ → GLB | A self-contained GLB | Triangulated OBJ; confirm source units |
| GLB → OBJ | OBJ, MTL and base-color textures in a ZIP | Static models only; default scene |
| GLB → STL | Binary triangle geometry | Static models only; default scene |
Materials and extensions
glTF packing and unpacking support core glTF 2.0, KHR_materials_unlit and KHR_texture_transform. Supported animations, skins and morph targets are retained for these packaging routes. Any other used extension makes the model preview-only.
The viewer includes local Draco, Meshopt and Basis/KTX2 decoders. Preview compatibility does not enable compressed-model exports. Unknown required extensions are rejected. OBJ uses a base-color material subset; STL contains no materials or textures.
Resource budgets
These are protective ceilings, not a guarantee that every model at the limit will load on every device. High-complexity files can require substantially more memory than their compressed size.
| Budget | Desktop | Small-screen mode |
|---|---|---|
| Total selected files | 50 MiB | 10 MiB |
| Unpacked data | 200 MiB | 40 MiB |
| Triangles | 200,000 | 100,000 |
| Files per package | 200 | 200 |
| Texture edge | 4,096 pixels | 4,096 pixels |
| Decoded textures | 256 MiB | 64 MiB |
What “checked” means
GLB/glTF outputs undergo Khronos structure validation and are read back to compare geometry and supported scene semantics. OBJ outputs are re-read with their material resources. STL outputs are parsed by a separate loader and compared with the selected world-space triangles. Geometry uses a tolerance of max(0.00001 meter, bounding-box diagonal × 0.00001).
These checks do not establish identical lighting in every renderer, manufacturing suitability, watertightness or printability. Each report separately lists checked and unchecked properties. FBX, CAD, model repair and batch conversion are not available in this version.
Unpack a GLB
Open a GLB below and choose “glTF + resources”. The ZIP keeps the scene and its associated resource files together.