What is preserved
Core mesh and component transforms supported by ThreeMFLoader become STL triangles.
Free · No signup · Browser-local
3MF to STL Converter
Extract printable surface geometry from a supported 3MF package into a simple STL.
Convert locally
Select your 3MF file
Choose a local 3D file to start the preview.
What can be lost or unsupported
- Base materials, textures, and vertex colors
- Units and manufacturing metadata
- Unsupported 3MF extensions and production properties
How to use this tool
- Choose a local .3mf file under 100 MB.
- Wait for the preview and statistics.
- Convert and download the result: .stl
Common uses
- Open 3MF geometry in an STL workflow
- Inspect before slicing
- Create a geometry-only fallback
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.