Updated 2026-08-17
How to Optimize GLB Files for the Web
Large 3D models can slow down web pages and AR viewers. Simple compression and cleanup techniques can cut GLB file size in half without losing quality.
Why GLB size matters on the web
Mobile users and visitors on slower connections can wait a long time for a 50MB GLB to download. Even a 10MB model starts to hurt page performance. Aim for under 5MB for web deployment when possible.
Practical optimization techniques
Most of these happen in a 3D tool before export, but a few can be done after.
- Reduce polygon count: simplify mesh detail or use LOD (levels of detail).
- Compress textures: use smaller resolution or lower-quality formats.
- Remove unused materials: strip out data not visible in the viewer.
- Bake details: merge high-detail textures into simpler geometry.
- Use mipmaps: let viewers load lower-res textures on distant objects.
Export settings
When exporting to GLB, use these settings to reduce size:
- Enable mesh quantization (rounds vertex data to fewer bytes).
- Disable animation if not needed.
- Use binary format (GLB, not JSON-based glTF).
- Compress the file after export (gzip is standard).
Verify the result
After optimization, drop the GLB into a free viewer to make sure quality is acceptable and the model still loads without errors.