3MF to STL Converter with Live 3D Preview
Upload your 3MF, inspect the geometry in 3D, set scale and positioning, then export a printing-ready STL. All 3MF to STL conversion runs locally in your browser for speed and privacy.
Upload 3MF File
Drag and drop 3MF file here
or click to browse from your computer
3D Preview
Upload a 3MF file to preview
How to Convert 3MF to STL
3 steps to finish 3MF to STL: upload, preview, download. Everything runs locally with a Parameters modal for print-ready STL output.
- Drag and drop or click to upload a 3MF (≤50MB). We parse it locally and show objects, triangle count, and bounding size.
- Inspect the mesh in live 3D preview, confirm scale, centering, and drop-to-floor. Switch merge or separate mode inside the Parameters modal when needed.
- Click Convert to STL to export. Merge mode outputs one STL; separate mode downloads a ZIP of parts. Geometry accuracy and proportions are maintained.
Accurate 3MF to STL Geometry
Parses the 3MF scene graph and external model files to keep vertices and indices precise when exporting to STL. Default centering, drop-to-floor, and scaling controls make the STL slicer-ready.
Geometry is preserved; colors/materials are not in STL, matching the Tip that STL carries mesh only. Great for multi-part assemblies that must stay accurate.
Local & Private Processing
Every 3MF to STL step runs locally in your browser—uploads are never sent to any server, protecting IP-sensitive models.
Live 3D preview lets you verify details instantly, following the Tip to keep processing local for privacy and speed.
Print-Ready Controls
Use the Parameters modal to set scale, max dimension, merge or separate export, centering, and drop-to-floor so the STL fits your printer volume.
Tip-aligned guidance: check model scale before slicing, and choose merge vs. separate (ZIP) exports depending on your print workflow.
3MF to STL Converter FAQ
Key answers about color loss, scaling, split exports, and privacy during 3MF to STL conversion.
How do I convert 3MF to STL?
Upload your 3MF, preview the model, then open the Parameters modal to pick merge/separate, scaling, centering, and drop-to-floor. Click Convert to STL to download. The entire 3MF to STL flow runs locally in your browser.
What is the difference between 3MF and STL?
3MF supports color, materials, and textures, while STL keeps only mesh geometry. 3MF is modern and smaller; STL remains the most compatible with slicers. Use this tool to switch formats quickly when you need a print-ready STL.
Will I lose any data when converting 3MF to STL?
Geometry is preserved, but STL does not include colors, materials, or textures—only the 3D shape is exported. This aligns with the tip: STL format only contains 3D geometry.
Can I convert multiple objects in one 3MF file?
Yes. After upload, choose Merge all meshes into one STL or Export each mesh as separate STL (ZIP) in the Parameters modal to fit your print workflow.
Is there a file size limit?
3MF files up to 50MB are supported. Processing is local; for heavy meshes, simplify in your CAD tool first to improve speed.
Are my files uploaded to a server?
No. 3MF to STL is fully local, so your models never leave your device—privacy and IP are protected end-to-end.