Input
Wavefront OBJ
Plain-text geometry with UV coordinates. Materials are stored separately, in an .mtl file.
OBJ to STL converter
Convert OBJ to STL for free, directly in your browser. Files are never uploaded — everything runs on your own machine. No sign-up, no software to install.
Output
Stereolithography
The 3D printing format: triangles only, no colour, UV or hierarchy. Every slicer understands it.
- A neighbouring .mtl file is not picked up: only the .obj itself is loaded.
- STL stores triangles only, so colour, textures and UV coordinates are not carried over.
- The object hierarchy collapses into one solid mesh — that is what the format requires.
- The model is rotated Z-up automatically, the way slicers expect it.
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