3D File Formats: glTF, OBJ, FBX, and STL Explained
Compare 3D file formats for web visualization, game development, 3D printing, and interchange. Understand what each format stores and the tradeoffs between simplicity, features, and ecosystem support.
Key Takeaways
- Unlike 2D images where JPEG and PNG dominate, the 3D world uses many specialized formats with different strengths.
- glTF (GL Transmission Format) is the open standard for 3D on the web.
- STL stores only triangle mesh geometry — no colors, materials, or metadata.
- 3D printing**: STL (simple) or 3MF (color, multi-material)
The 3D Format Landscape
Unlike 2D images where JPEG and PNG dominate, the 3D world uses many specialized formats with different strengths. The right choice depends on whether you need animation, materials, scene hierarchy, or just raw geometry.
Format Comparison
| Format | Geometry | Materials | Animation | Scene | File Type |
|---|---|---|---|---|---|
| glTF/GLB | Yes | PBR | Yes | Yes | Binary/JSON |
| OBJ | Yes | Basic (MTL) | No | No | Text |
| FBX | Yes | Yes | Yes | Yes | Binary |
| STL | Yes | No | No | No | Binary/Text |
| USDZ | Yes | PBR | Yes | Yes | Binary (Apple) |
glTF: The JPEG of 3D
glTF (GL Transmission Format) is the open standard for 3D on the web. Its binary variant (GLB) packages geometry, textures, and animations in a single compact file. Three.js, Babylon.js, and every major 3D web library support glTF natively.
STL for 3D Printing
STL stores only triangle mesh geometry — no colors, materials, or metadata. Despite its limitations, it remains the universal 3D printing format because slicing software only needs geometry. 3MF is the modern replacement but adoption is still growing.
Choosing Your Format
- Web visualization: glTF/GLB
- 3D printing: STL (simple) or 3MF (color, multi-material)
- Game development: FBX (legacy) or glTF (modern)
- Simple mesh exchange: OBJ
- Apple AR: USDZ