STL vs FBX
STL and FBX sit at opposite ends. STL is a minimal printing format with triangles only. FBX is a rich scene format with materials, rigs and animation for games and film. Going from FBX to STL is a common step before 3D printing a character, and it drops everything except the shape. Going from STL to FBX gives an engine-friendly file, but no materials appear that weren't there.
Side by side
| STL | FBX | |
|---|---|---|
| Full name | stereolithography mesh | Autodesk Filmbox |
| Created by | 3D Systems | Kaydara, now Autodesk |
| Introduced | 1987 | 1996 (as Filmbox) |
| Encoding | binary or ASCII | proprietary binary or ASCII |
| File size | compact in binary; repeats every shared vertex | medium; can embed textures |
| Materials | No | Yes |
| Textures | No | Yes |
| Animation | No | Yes |
| Colour | no colour or materials | materials and textures (often referenced externally) |
| Units | unitless (slicers assume millimetres) | usually centimetres |
| Best for | 3D printing slicers | Maya, 3ds Max, Unity and Unreal pipelines |
Choose STL when
- •You're 3D printing.
- •Only the geometry matters.
- •A print service asks for STL.
Choose FBX when
- •The model is going into a game engine or animation tool.
- •It has a rig, animation or multiple materials.
- •You're working in Autodesk software.
Which apps open them
Of the 15 3D apps in our software guides, 9 open STL without conversion and 10 open FBX. Only STL opens directly in Bambu Studio, OrcaSlicer, PrusaSlicer, UltiMaker Cura. Only FBX opens directly in Unity, Unreal Engine, Godot, Maya, Roblox Studio.
Questions
- Is STL better than FBX?
- Neither is better everywhere. You're 3D printing: choose STL. The model is going into a game engine or animation tool: choose FBX.
- Can I convert STL to FBX?
- We convert FBX to STL, but not the other way yet. Export FBX from the app that made the STL file instead.
- Which file is smaller, STL or FBX?
- STL: compact in binary; repeats every shared vertex. FBX: medium; can embed textures. 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 Spotted something out of date?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.