3MF to STL
Convert a 3MF file to STL so older slicers and tools can open it. Multi-object plates keep their positions. The conversion happens in your browser, so there is no upload, no size limit and no queue.
Drop a 3MF file anywhere
or
No size limitNo accountNothing uploadedWorks offline
Common questions
- Why would I need to convert 3MF to STL?
- 3MF is the default output of most modern slicers and CAD tools, but a great deal of older software, print services and online viewers still only accept STL. Converting gets your model into whatever needs it.
- Are multi-object plates handled correctly?
- Yes. Each object in the build is placed using its own transform, so a plate laid out with several parts converts with those parts in the same positions rather than stacked at the origin.
- Is my file uploaded?
- No. The 3MF archive is unzipped and the STL written entirely by your browser. Nothing is transmitted, and that is also why there is no file-size cap.
- What is lost in the conversion?
- STL stores geometry only, so colours, materials and per-object metadata present in a 3MF cannot be carried across. The mesh itself converts exactly.
- Binary or ASCII STL?
- Binary, which every slicer reads and which produces files roughly five times smaller than ASCII for the same mesh.
- Is there a file size limit?
- No. Conversion happens in your browser, so the practical limit is your available memory rather than an upload cap. Most online converters restrict free users to somewhere between 5 and 25 MB because they pay for the compute; here nobody does.
Exact. Vertices and triangles are transferred without resampling, so the converted mesh is geometrically identical to the source. Only the container format changes. 3MF features STL cannot express, such as colour and materials, are dropped, and the tool says which were present.