Kept
- The triangles of every object in the package
- Millimetre dimensions (3MF declares its unit)
- Object transforms baked into the vertices
Runs locally · no upload
Convert 3MF to STL
Turn a 3MF package into an STL mesh. 3MF stores units and materials; STL only keeps triangles, so colours and part names disappear while the geometry stays.
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Drop a 3D file hereSTL, OBJ, PLY, GLB, glTF, 3MF or STEP · up to 100 MB · processed locallyYour file never leaves this browser.
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What changes in the conversion
Dropped
- Colours, materials and textures
- Object and part names
- The ZIP package and its metadata
Common mistakes
- A 3MF that only contains a build plate or metadata has no mesh to convert.
- Protected or encrypted 3MF files are rejected by the parser.
- A large multi-object plate can exceed 100 MB; split it in your slicer first.
For 3D printing
- STL keeps the millimetre values but not the unit: most slicers assume mm, which matches 3MF.
- Colours are lost. Keep the 3MF if your printer supports multi-material printing.
Drop the file — it is read locally, never uploaded.
Choose the options, then convert or compress.
Download the result and open it in your slicer or 3D software.
Frequently asked questions
Does 3MF to STL keep the colours?+
No. STL has no material support; the triangles are kept and every colour or material is dropped.
Is the scale preserved?+
Yes. 3MF declares millimetres and the numbers are kept as-is; check the scale in your slicer if the file came from another unit.
Can I convert a multi-object 3MF?+
Yes. All meshes are merged into one STL, which is what most slicers expect for a single print.
Need a model instead of a conversion?
Turn a photo, a drawing or a logo into a 3D model, then export it in the format you need.