Convert STL to OBJ.
Convert an STL 3D model to OBJ for editing in most 3D software. Vertices and faces preserved exactly.
STL vs OBJ: from printing to editing
STL describes a model as a plain mesh of triangles, perfect for slicers and 3D printers, but minimal. OBJ is the long-standing interchange format that virtually every 3D application reads, from Blender and Maya to ZBrush, which makes it the natural choice when you want to actually edit or rework a model rather than just print it.
What's preserved
Vertices and faces transfer exactly, and multi-part STLs are merged into a single clean mesh. OBJ can also store texture coordinates and material references (via a companion .mtl file), but since an STL carries no colour or material data, there's none to bring across: you'd add UVs and materials in your editor.
Round-tripping
Done editing and ready to print again? OBJ to STL converts it back. For showing the model on the web or in a game engine instead, STL to GLB is the better target.
How it works
- 01
Upload your STL
Drop a 3D model or pick one from your device. Private by default.
- 02
Convert with trimesh
trimesh reads the geometry and writes OBJ, vertices and faces preserved exactly, no paid API in the loop.
- 03
Download
Grab your OBJ.
Geometry preserved exactly, vertices & faces
Watertight meshes stay watertight
Private uploads, auto-deleted after 1 hour
No watermark, no signup to try
Free and open-source engine (trimesh)
STL to OBJ
This converts the 3D geometry from STL to OBJ. Vertices and faces carry over; support for colour, materials and textures depends on the target: OBJ keeps more scene data.
Common questions
Is it free?+
Yes. Convert STL to OBJ free. No signup, no watermark, no daily cap.
Is my model private?+
Uploads go to a private bucket, are converted, and auto-delete after 1 hour. Files never touch a third-party converter.
Is the geometry changed?+
No. Vertices and faces are preserved exactly. Multi-part scenes are merged into a single mesh for clean output.
Related conversions