GLB vs STL
These formats serve different jobs. GLB is a full display format with colours, textures, scene structure and animation, built for screens. STL is a printing format with nothing but triangles. To print a GLB, convert it to STL and you keep the shape; going from STL to GLB gives you something you can view and share on the web, but you'll need to add colour, because STL never had any.
Side by side
| GLB | STL | |
|---|---|---|
| Full name | binary glTF | stereolithography mesh |
| Created by | Khronos Group | 3D Systems |
| Introduced | 2017 (glTF 2.0) | 1987 |
| Encoding | binary, one file | binary or ASCII |
| File size | small; textures stored compressed | compact in binary; repeats every shared vertex |
| Materials | Yes | No |
| Textures | Yes | No |
| Animation | Yes | No |
| Colour | PBR materials and embedded textures | no colour or materials |
| Units | metres by convention | unitless (slicers assume millimetres) |
| Best for | the web, Godot, three.js, Android AR and general sharing | 3D printing slicers |
Choose GLB when
- •The model will be viewed on a screen, in AR or in an engine.
- •Colour, textures or animation matter.
- •You're sharing it on a website or with a viewer link.
Choose STL when
- •The model is going to a slicer or print service.
- •Only the physical shape matters.
- •You want the most universally accepted printing file.
Which apps open them
Of the 15 3D apps in our software guides, 9 open GLB without conversion and 9 open STL. Only GLB opens directly in Unity, Unreal Engine, Godot, Roblox Studio, Shopify. Only STL opens directly in 3ds Max, Bambu Studio, OrcaSlicer, PrusaSlicer, UltiMaker Cura.
Questions
- Is GLB better than STL?
- Neither is better everywhere. The model will be viewed on a screen, in AR or in an engine: choose GLB. The model is going to a slicer or print service: choose STL.
- Can I convert GLB to STL?
- Yes. Our GLB to STL converter runs in your browser. Textures are dropped, because STL can't store them.
- Which file is smaller, GLB or STL?
- GLB: small; textures stored compressed. STL: compact in binary; repeats every shared vertex. 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 Spotted something out of date?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.