GLB vs 3MF
GLB is built for displaying models on screens; 3MF is built for manufacturing them. GLB carries textures, PBR materials and animation; 3MF carries units, per-object colours and print settings. A GLB can be turned into a printable STL or 3MF shape, but textures don't carry over to a print, and 3MF data like print settings means nothing to a web viewer.
Side by side
| GLB | 3MF | |
|---|---|---|
| Full name | binary glTF | 3D Manufacturing Format |
| Created by | Khronos Group | 3MF Consortium |
| Introduced | 2017 (glTF 2.0) | 2015 |
| Encoding | binary, one file | ZIP archive of XML |
| File size | small; textures stored compressed | small, because it's zipped |
| Materials | Yes | Yes |
| Textures | Yes | No |
| Animation | Yes | No |
| Colour | PBR materials and embedded textures | colours and print settings |
| Units | metres by convention | millimetres, stored in the file |
| Best for | the web, Godot, three.js, Android AR and general sharing | modern slicers like Bambu Studio, PrusaSlicer and OrcaSlicer |
Choose GLB when
- •The model is for a website, AR or a game engine.
- •You need textures, animation or PBR materials.
- •You're sharing for viewing rather than printing.
Choose 3MF when
- •The model is going to a modern slicer.
- •You want colours per object for multi-material printing.
- •You want the size stored in real units.
Which apps open them
Of the 15 3D apps in our software guides, 9 open GLB without conversion and 6 open 3MF. Only GLB opens directly in Blender, Unity, Unreal Engine, Godot, Roblox Studio, Shopify, Sketchfab. Only 3MF opens directly in Bambu Studio, OrcaSlicer, PrusaSlicer, UltiMaker Cura.
Questions
- Is GLB better than 3MF?
- Neither is better everywhere. The model is for a website, AR or a game engine: choose GLB. The model is going to a modern slicer: choose 3MF.
- Can I convert GLB to 3MF?
- We convert 3MF to GLB, but not the other way yet. Export 3MF from the app that made the GLB file instead.
- Which file is smaller, GLB or 3MF?
- GLB: small; textures stored compressed. 3MF: small, because it's zipped. Actual size depends mostly on polygon count and texture resolution.
Written with AI assistance by the Renderlyst team in October 2026. Format support reflects each app's current release as we understand it, and we link the official documentation so you can confirm it for your version. Spotted something out of date? Email alishbakhalid766@gmail.com.