Free 3D converter / 3MF to STL
Convert 3MF to STL, free and online
Turn a .3mf file into a .stl file. It runs in your browser: no sign-up and nothing to install, and most files never leave your computer.
Drop your 3MF file here
or choose a file
Free · No sign-up · Converted in your browser · Files up to 1 GB
What you get: STL keeps geometry only: colours, materials and textures are dropped, and every part goes into one STL.
How to convert 3MF to STL
- 1Drop your .3mf file
On the converter above, or click to choose it. - 2Click Convert to STL
The .stl file downloads straight away.
3MF vs STL
3MF: 3MF is the modern 3D printing format: meshes with units, colours and build settings in one package.
STL: STL describes a shape as triangles only: no units, no colours, no curves. It's what 3D printers, slicers and scanners use.
Other conversions
All conversions →Is the 3MF to STL converter free?
Yes, with no sign-up and no limit on the number of files. A free account is only needed if you want to send the model to someone for feedback.
Is my file uploaded?
Most files are read and converted right in your browser and never leave your computer. Very large CAD and mesh files are converted on our server instead, then deleted straight after the converted model is sent back to your browser.
What's the biggest 3MF I can convert?
Up to 1 GB. Big files take longer, and very large CAD files go through our server, as above.
What units is the STL in?
Millimetres, which is what CAD programs and slicers expect.
Does it keep colours?
No. STL has no colours or materials, only the shape. Convert to GLB to keep them.
Converting it to send to a client or supplier?
Send them a link instead. They open the model in any browser, with no account and no CAD program, and click the spot they want changed.