What is preserved
Mesh positions and visible surface geometry are preserved where the source parses successfully.
Free · No signup · Browser-local
OBJ to STL Converter
Turn OBJ surface geometry into a compact binary STL for slicers and geometry-only workflows.
Convert locally
Select your OBJ file
Choose a local 3D file to start the preview.
What can be lost or unsupported
- MTL materials and texture references
- UV usefulness
- Object hierarchy and names
- Units and scale metadata
How to use this tool
- Choose a local .obj file under 100 MB.
- Wait for the preview and statistics.
- Convert and download the result: .stl
Common uses
- Prepare an OBJ mesh for a slicer
- Create a geometry-only interchange file
- Inspect an OBJ before exporting
Frequently asked questions
Are my files uploaded?
No. Model parsing, preview, and export run in your browser.
Is the conversion lossless?
No format conversion is described as lossless. Review the format-specific warnings above before using the output.
What is the file-size limit?
100 MB is a safety ceiling, not a guarantee. Mobile devices may need substantially smaller files.