Convert STL to glTF
Convert a STL file to glTF in your browser. Free, no upload, no sign-up.
Convert STL files to glTF directly in your browser. The converter parses the STL mesh, rebuilds it in memory and writes it out as glTF, keeping every triangle. Nothing is uploaded, there is no file size limit beyond your computer's memory, and the result downloads instantly. glTF gives you a readable JSON scene that is easy to inspect, diff or post-process in a build pipeline.
How to convert STL to glTF
- 1Drop your STL file
Drag a .stl file onto the box above or click to choose one.
- 2Check the preview
The model renders in 3D so you can confirm it loaded correctly. Dimensions, volume and triangle count are shown next to it; open edges are flagged if the mesh is not watertight.
- 3Download the glTF
Adjust the export options if needed and click download. Buffers are embedded in the JSON as base64, so the output is a single file.
What is a STL file?
STL is the oldest and most widely supported 3D printing format. It stores nothing but a list of triangles, with no color, texture, unit or scale information. Every slicer and almost every 3D tool can read it, which is why it is still the default exchange format for printable models.
Commonly used by: 3D printer slicers (Cura, PrusaSlicer, Bambu Studio), CAD export, Thingiverse / Printables
What is a glTF file?
glTF is the JSON form of the same Khronos standard as GLB. The .gltf file describes the scene as readable JSON; binary buffers and textures may be embedded as base64 or kept as separate files. It is convenient when you want to inspect or edit the scene description by hand.
Commonly used by: web developers, Babylon.js / three.js, Blender, Unity and Unreal importers
glTF gives you a readable JSON scene that is easy to inspect, diff or post-process in a build pipeline.
STL vs glTF
| STL | glTF | |
|---|---|---|
| Full name | Stereolithography | GL Transmission Format |
| Encoding | Text or binary | Text |
| Geometry type | Triangle mesh | Triangle mesh |
| Colors | No | Yes |
| Textures | No | Yes |
| Materials | No | Yes |
| Stores units | No | Yes |
| Multiple objects | No | Yes |
| Typical use | 3D printer slicers (Cura, PrusaSlicer, Bambu Studio), CAD export, Thingiverse / Printables | web developers, Babylon.js / three.js, Blender |