What this conversion keeps
STL stores geometry but no units or slicer settings. This converter creates a basic 3MF with the geometry and the unit you choose; it cannot recover print settings, materials or colours that were never in the STL.
Browser-local conversion
STL to 3MF Converter
Create a basic, standards-compliant 3MF from STL geometry without uploading your file.
Choose an STL file
Converted locally in your browser — your file is not uploaded.
Files must be 25 MiB or smaller so conversion remains safe for this browser.
Drag and drop a file here, or choose a file
This declares what the existing STL coordinates mean; it does not resize the model.