Converters · OBJ → STL
OBJ to STL Converter
Free, private, in your browser. Convert OBJ to STL — no signup, no upload.
⇄ Need STL to OBJ instead?OBJ → STLNO UPLOAD · RUNS LOCALLY
Drop your 3D file here
or click to browse — .obj files up to 200 MB
When you need this
You modeled or downloaded an OBJ and need a printable STL for your slicer — the single most common reason people leave OBJ behind.
OBJ to STL — FAQ
What happens to the .mtl material file?
It’s not used — STL can’t represent materials, so only the geometry from the .obj is converted.
Is the output watertight?
The converter preserves your source topology as-is. If your OBJ has holes or non-manifold edges, run it through our free STL Repair tool first.
Diagnosis & basic repairFree
Deep repair (keeps colors)20 credits
Image to 3D generation30 credits
100 credits$9.90
All plans →