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AMF file format (.amf)

AMF (Additive Manufacturing File Format)

What is a AMF file?

AMF was the ISO/ASTM attempt to fix STL for additive manufacturing: curved triangles, colors, materials and constellations in a compact XML file. Adoption ultimately went to 3MF, but AMF files still appear in research and older 3D-printing toolchains.

  • Units, colors and multi-material support
  • ISO/ASTM standardized
  • More compact than ASCII STL

Best for: Reading legacy additive-manufacturing data.

View AMF files online

Open .amf files in the free online AMF viewer — assembly tree, section views and display modes, entirely in your browser.

How to open a AMF file

  1. Open the online AMF viewer. It runs in your browser, so there is no software to install and no account to create.
  2. Drop your .amf file in. The file is parsed locally and never uploaded. Inspect it with the assembly tree, section views and display modes.
  3. Convert it if you need another format. Press Convert to turn AMF into STL, then download the result straight from your browser.

Convert AMF to other formats

AMF to STLAMF to OBJAMF to PLYAMF to GLBAMF to glTFAMF to 3MFAMF to OFFAMF to USDZ

Frequently asked questions

How do I open a .amf file?

Drop it into the free online AMF viewer on this site — it renders in your browser with an assembly tree and section views, and the file is never uploaded. No software install needed.

Does AMF store units and colors?

Units: yes. Colors/materials: colors & multi-material. Geometry is stored as curved-triangle mesh.

How do I convert AMF to STL?

Use the free AMF to STL converter: drop the file, press Convert, download. Everything runs locally in your browser — no upload, no signup.

What is AMF best used for?

Reading legacy additive-manufacturing data.

Is AMF a safe replacement for the original CAD model?

No. AMF can carry units, colors and richer additive-manufacturing data than STL, but its geometry is still tessellated. It cannot preserve exact CAD surfaces or modelling history.

Can AMF store animation?

No. AMF is used for additive manufacturing (legacy), and its format does not carry animation tracks.