How it works
- Drop your STLThe mesh is read directly in your browser — binary and ASCII variants are auto-detected.
- Vertices are weldedSTL stores every triangle separately; we merge duplicate corner points into shared vertices, which is what OBJ expects and what makes the file smaller.
- Download the OBJA clean, standards-compliant OBJ file ready for Blender, Maya, 3ds Max, Unity or Unreal.
Why convert STL to OBJ?
STL is the lingua franca of 3D printing: slicers like Cura and PrusaSlicer read it natively, and every printable model repository offers it. But STL is also a very limited format — it stores nothing except raw triangles. No shared vertices, no polygon groups, no UV coordinates, no materials. The moment you want to edit a model rather than print it — sculpt it in Blender, texture it, drop it into a game engine — you want OBJ instead.
Because STL repeats the coordinates of every triangle corner, the same point on the surface may be written to the file dozens of times. During conversion this tool welds those duplicates into shared, indexed vertices. The result is a proper connected mesh: smaller on disk, and far friendlier to modeling tools, which can now treat the surface as one continuous shell instead of triangle soup.
Model files are often paid purchases or client work, so this converter — like every tool on LocalConvert — runs entirely on your device. Your model is never uploaded to any server.