STL to OBJ conversion helps when a model starts as a print-ready STL but you want to open it in a mesh editor or modeling app. This tool reads the STL triangles in your browser, writes a Wavefront OBJ file, and previews the mesh before download. It works with both ASCII and binary STL files.
How to convert STL to OBJ online
- Upload an ASCII or binary .stl file.
- Click Convert to read the triangle data.
- The tool writes each STL triangle as OBJ vertices and faces.
- Preview the converted mesh, download the .obj file, and open it in your modeling software.
If you only need to inspect the STL first, use our Free Online STL Viewer. If you later need an STL again for slicing, use the OBJ to STL converter.
What changes when STL becomes OBJ
STL is a very simple print mesh format. It does not carry textures, UVs, materials, object groups, or smoothing data. The OBJ created here is also plain geometry because there is no extra visual data in the STL to preserve.
The output is useful for editing, cleanup, measurements, and moving the mesh into tools that prefer OBJ. It will not turn the model into editable CAD features. For heavy editing, you may still need a mesh repair or retopology workflow.