3MF to STL
Convert 3MF to STL: every object and component with its build transform, units converted to millimetres.
How it works
Open the 3MF
Drop the file: STL, OBJ, PLY, OFF, 3MF, GLB or glTF (with its .bin if it has one). It is read in your browser and shown in 3D.
Check it
Turn it with the mouse or a finger. The size, the triangle count and whether the mesh is closed are listed, so a bad file is caught before the printer or the game engine sees it.
Download the STL
Pick the format and download. Axes and units are converted for you: glTF is Y-up in metres, printers are Z-up in millimetres.
3MF to STL converter: free and online
Convert 3MF to STL in your browser: drop in a 3MF file and download the STL. The file is converted on your own device and never uploaded, so this 3mf to stl converter is safe for private and confidential files.
3MF is the modern 3D printing format, holding units and colour where STL cannot. STL is the 3D printing format: a closed surface of triangles that every slicer reads.
The paths come out at the real size you set, in millimetres or inches, ready for a laser, a CNC router, a vinyl cutter or a plotter.
More conversions from 3MF: 3MF to OBJ, 3MF to STEP.
Other conversions to STL: Sketch to STL, SVG to STL, Image to STL, Image to STL, OBJ to STL, GLB to STL.
People also search for
- 3mf to stl free
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Why it matters
The right way up and the right size
A 20 mm part stays 20 mm and upright: glTF's metres and Y-up axis are converted to and from the millimetres and Z-up of STL, 3MF and slicers.
Checked against a reference
Every format pair is tested against trimesh: the same volume, surface area and size come back out.
Nothing uploaded
Client parts and unreleased designs stay on your computer. The model is read and written in this tab.
Questions
How do I convert 3MF to STL?
Drop your 3MF file on this page, check the preview, and press Download. The STL is made in a few seconds, with no sign-up.
Is my 3MF file uploaded anywhere?
No. The 3mf to stl conversion runs in your browser, on your own device. The file never leaves it.
Which 3D formats can I convert?
STL (binary and ASCII), OBJ, PLY (ASCII and binary), OFF, 3MF, GLB and glTF, in and out, in any combination.
Are colours and textures kept?
No: the shape is converted, every triangle of it, but not colours, textures or materials. The page says when the file had them. For printing and CAD that is what matters; for a textured game asset, keep the GLB.
Why is my glTF so small or lying on its side?
glTF measures in metres and stands models on the Y axis; STL and slicers use millimetres and the Z axis. This converter turns and scales between them, and "Keep axes and units as they are" turns that off.
Can it convert STEP or IGES?
Yes, into any of the mesh formats: drop the .step, .stp, .iges or .igs file and OpenCASCADE cuts its solids into triangles in your browser. The other way, a mesh is saved as a STEP solid made of flat faces (see the STL to STEP converter).
What about compressed glTF?
Draco and meshopt compressed glTF files are recognised and reported; export them again without mesh compression to convert them here.