Convert OBJ to STL
Free online OBJ-to-STL converter. No sign-up, no upload, no watermark — it runs entirely in your browser.
Drop your OBJ file here
or click to browse · we convert it to STL instantly
100% in your browser — your file never leaves your device.
Converting Wavefront OBJ to STL (stereolithography)
OBJ is a simple, widely supported mesh format that can reference materials in a separate .mtl file. STL is the universal 3D-printing format. Converting OBJ to STL gives you a clean, single-file mesh ready for any slicer.
What's kept and what's dropped
The triangle geometry is preserved exactly. OBJ materials, UVs and the linked .mtl file are dropped — STL stores shape only.
How to convert OBJ to STL
- 1Drop your OBJ file onto the box above, or click to browse for it.
- 2Sculptor converts it to STL right in your browser — nothing is uploaded.
- 3Your STL file downloads automatically. That's it.
OBJ to STL — FAQ
- Is the OBJ to STL converter free?
- Yes, free with no sign-up and no limits on file count or size beyond your own device's memory.
- Is my OBJ uploaded anywhere?
- No. Everything happens locally in your browser — your model is never sent to a server.
- What happens to the .mtl material file?
- STL is geometry-only, so materials are ignored. Only the mesh shape is converted — exactly what a 3D printer needs.
- Why convert OBJ to STL?
- To 3D print it. STL is the format virtually every slicer (Cura, PrusaSlicer, Bambu Studio) expects.
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