OFF to STL conversion helps when an Object File Format mesh needs to open in a slicer or STL-only viewer. This browser tool reads OFF vertices and faces, turns polygon faces into triangles, and exports a binary STL. It is best for simple geometry files from mesh libraries, research tools, or older modeling workflows.
How to convert OFF to STL online
- Upload an .off or .coff file from your computer.
- Click Convert to read the vertex and face lists.
- Let the tool triangulate polygon faces for STL output.
- Preview the STL, download it, and check it in your slicer or viewer.
OFF is less common in 3D printing than STL or 3MF. If a slicer cannot read the OFF file directly, converting to STL usually makes the mesh easier to inspect, repair, and prepare for printing.
What changes when OFF becomes STL
OFF files can store polygon faces and, in COFF files, vertex color values. STL only stores triangle geometry. The exported STL keeps the shape, but it does not keep colors, labels, comments, or extra vertex data.
This converter does not repair broken meshes. If the source OFF file has open edges, self-intersections, or non-manifold geometry, the STL can carry those issues forward. Check the result before printing.