STL to 3MF
Convert STL to a 3MF model online. Preview dimensions and export a file with explicit units for slicer import. Free, no sign-up required.
Your model goes here.
Choose your file or try the original sample below. No installation or sign-up.
01 / HOW IT WORKS
Open, inspect, then use your result.
- 01
Open your file
Choose, drop or paste your STL file. All three input methods use the same local checks.
- 02
Look from every angle
Orbit, zoom and switch between standard views. Read the dimensions and object count beside the model.
- 03
Download the converted file
After conversion, download 3MF. Open the result in your destination software and check the units before use.
02 / TRY IT YOURSELF
A real file. A result you can check.
This original four-hole plate measures 80 × 50 × 8 mm. The sample uses the input format for this page. Use the default unit and axis settings to reproduce those dimensions.
Original public sample. Your uploads are never added to this gallery.
03 / FORMAT & USE
STL to 3MF
Prepare STL geometry for slicer import in a single 3MF file. Separate mesh objects retain their positions and the output declares millimeters. STL does not reliably declare units. Choose the original units before exporting to avoid a model that is too small or too large.
What this viewer supports
This is a model-only 3MF, without printer profiles, supports, slicing settings or G-code. Conversion does not repair meshes or certify printability.
Supports files up to 32 MiB, 1 million triangles and 2,000 mesh objects. For larger assemblies, export only the parts you need.
04 / QUESTIONS
Know your input. Understand your output.
Can I send this 3MF directly to my printer?
Import it as a model into your slicer, check scale and orientation, choose a printer and material, then slice it. It is not a ready-to-print machine file.
Do I need an account or credits?
No. These tools are free and run in your browser. No account, subscription or credits are required.
Is my model uploaded?
No. Your selected file is read and processed in this browser. The page downloads its CAD engine and public samples, but does not upload your model. Refreshing or leaving the page clears the current file from the tool.
How are units and orientation handled?
Dimensions use millimetres with Z up. GLB uses metres with Y up; exported STL is mm/Z-up and OBJ is mm/Y-up.
Can I paste a file from my computer?
Copy a file in your file manager, then paste here. Your browser must expose the clipboard as a file; a copied path or text will not open a model.