3MF is the modern 3D-printing format: an OPC zip of XML model parts with materials and units — STL's successor designed by Microsoft, HP and the printing industry.
Typical use: Convert 3MF print models to glTF or OBJ for previewing and editing.
About the 3MF format
3MF is what STL should have been: an OPC zip containing XML model parts with real units, materials, colors and print settings — designed by a consortium (Microsoft, HP, Ultimaker, Prusa) to fix STL's missing-everything problem. Modern slicers prefer it.
The XML model inside parses straight into a three.js scene, so 3MF converts to glTF for previews or OBJ for DCC tools without ever opening a slicer.
Strengths
- ✓ Units, materials and metadata included
- ✓ Industry-backed open standard
- ✓ Modern slicers prefer it over STL
Limitations
- ✗ Older printers still want STL
- ✗ XML verbosity for huge meshes
- ✗ Extension namespaces vary by vendor
- Structure
- OPC zip + XML model parts
- Types / schema
- XML mesh + materials
- Compatibility
- PrusaSlicer, Cura, Windows 3D Builder
- Best for
- 3D printing exchange
Convert 3MF to…
5 direct directions plus 19 workflows, sorted A–Z; 🔥 marks popular targets.
Frequently asked questions
What is a 3MF file?
3MF is the modern 3D-printing format: an OPC zip of XML model parts with materials and units — STL's successor designed by Microsoft, HP and the printing industry.
How do I convert 3MF files online?
Pick a target format from the "Convert 3MF to…" list below, drop your file and hit convert. Everything runs in your browser — no install, no upload, no watermark, no limits.
Is it safe to convert 3MF files here?
Yes. Every conversion is performed by your own device inside the browser — files never leave for a server, and the page keeps working even offline.
Which formats can 3MF convert to?
This page lists all 24 directions across documents, images, audio, video, spreadsheets and archives — each one is its own free converter page.