Step 1
Choose an STL file
Select a binary or ASCII .stl file up to 100 MB.
Free · Private · Browser-based
STL to OBJ Converter Online
Convert binary or ASCII STL triangle meshes into Wavefront OBJ geometry for use in modeling, repair, and interchange workflows. The entire conversion stays in your browser.
Drop STL file here
or browse your computer
Max 100 MB · processed locally
Your STL file stays on this device. Geometry is processed locally and is never uploaded.
How to convert STL to OBJ
Step 2
Read triangle geometry
The browser extracts vertices, faces, and available normals locally.
Step 3
Download the OBJ
Save one Wavefront OBJ file containing the converted triangle mesh.
STL and OBJ are different file formats
STL does not contain material or texture data, object names, or a defined unit. OBJ can reference those features, but conversion cannot recreate information that is absent from the STL source. The generated OBJ therefore contains the original triangle geometry and normals without invented materials.
| Property | STL | OBJ |
|---|---|---|
| Geometry | Triangle mesh | Polygon mesh |
| Materials | Not supported | Supported through MTL references |
| Best for | Slicing and 3D printing | Mesh editing and interchange |
STL to OBJ FAQ
Does STL to OBJ improve mesh quality?
No. Conversion changes the file structure but cannot add detail beyond the original STL triangles.
Will the OBJ include materials or textures?
No. STL does not store that information, so the generated OBJ contains geometry only.
Does the converter support binary STL?
Yes. Both binary STL and ASCII STL input are supported.
Can I edit the resulting OBJ?
Yes. Most mesh editors can open the OBJ, but it remains a triangle mesh rather than an exact CAD solid.
Need a print-ready STL?
Use the reverse converter to turn an OBJ mesh into STL output.