Convert STL to 3MF Online
Convert STL 3D models to 3MF format directly in your browser — a free STL to 3MF converter with no upload and no install. Preview the geometry, then download a valid 3MF package.
This .stl to 3mf conversion keeps your triangle geometry intact and produces a package that Cura, PrusaSlicer, and Bambu Studio can open directly.
Drop your STL file here
Supported format: .STL
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Model
- Triangles
- Dimensions
Conversion Complete
- Format
- File size
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Questions
Frequently Asked Questions
What is a 3MF file?
3MF (3D Manufacturing Format) is a modern, ZIP-based 3D printing format designed to replace STL, supporting richer metadata than STL allows.
How do I convert an STL file to 3MF?
Drop your .stl file into the STL to 3MF converter above, preview the model, then click Convert to 3MF and download the file. The conversion happens entirely in your browser, so there's nothing to install.
Can you convert STL to 3MF?
Yes — this tool converts STL geometry directly to a valid 3MF file, free, online, and directly in your browser.
Why convert STL to 3MF instead of just using STL?
3MF is a more structured, extensible container format increasingly preferred by newer slicers and 3D printing software, while remaining widely compatible.
Is my STL file uploaded to a server?
No. The conversion happens entirely in your browser. Your file is never sent to our servers.
Does this 3MF file include printer or slicing settings?
No — this converter outputs geometry only. Slicer-specific settings and multi-object project data aren't part of a plain geometry conversion.
Can I open the 3MF file in my slicer?
Yes. Most modern slicers (including Cura, PrusaSlicer, and Bambu Studio) accept 3MF files directly.