OpenAnyFile
Works
Viewing, inspecting and verifying. You get an interactive model you can orbit, pan and zoom, with lighting and a ground plane. File details, exact byte size and the detected signature are always shown.
How to open a .amf file
A AMF file is an Additive Manufacturing File, introduced by ASTM International in 2011. Below: what is actually inside one, and how to open it without installing special software.
What is a .amf file?
Additive Manufacturing File is a 3d & cad format developed by ASTM International, first appearing in 2011. It is normally produced by 3D printing slicers and exporters.
Created specifically to fix STL's limits: curved triangles, colour, multiple materials and explicit units, in compressed XML. 3MF later absorbed most of the role it was designed for.
| Full name | Additive Manufacturing File |
|---|---|
| File category | 3D & CAD |
| MIME type | application/x-amf |
| Magic bytes (file signature) | 3C 3F 78 6D 6C (<?xml) or 50 4B (zipped) |
| Developer | ASTM International |
| Introduced | 2011 |
| Usually created by | 3D printing slicers and exporters |
| OpenAnyFile engine | WebGL 3D stage |
| Opens without upload | Yes — parsed locally in your browser |
Open a .amf file in your browser
OpenAnyFile routes .amf to its WebGL 3D stage, which loads an interactive model you can orbit, pan and zoom, with lighting and a ground plane.
- Open the OpenAnyFile opener in this browser — nothing to download or sign up for.
- Drag your .amf file onto the drop zone, click to browse for it, or paste it with Ctrl+V.
- The extension is detected and the file is handed to the WebGL 3D stage.
- Your AMF opens on its own viewer page: an interactive model you can orbit, pan and zoom, with lighting and a ground plane.
- Use fullscreen for a closer look, or download the file back out unchanged. Nothing is transmitted anywhere — the parsing happens in your own browser process.
What you can and cannot do with it here
Does not work
Editing and re-saving. OpenAnyFile is a reader, not an editor — for changes you still need special software or an equivalent.
Your {ext} file stays on your device
The entire pipeline — detection, decoding, rendering — runs client-side. Your browser hands the bytes to a decoder compiled to WebAssembly, the result is drawn to the page, and that is the whole journey. No account is created, no file is stored, and no analytics event carries your filename. This is also why there is no size limit imposed by a server: the only ceiling is your own available memory.
Frequently asked questions about AMF files
Can I open a .amf file without installing special software?
Yes. OpenAnyFile's WebGL 3D stage runs in your browser, so you can read a AMF file with nothing installed. You get an interactive model you can orbit, pan and zoom, with lighting and a ground plane. For full editing you still need the original application — this is a viewer, not an editor.
How can I check a file really is a AMF file?
Look at the first bytes rather than the extension. A genuine AMF begins with 3C 3F 78 6D 6C (
Is it safe to open a AMF file online?
With OpenAnyFile, yes, because nothing is uploaded. The file is read locally through your browser's File API and never leaves your device, so there is no server copy to leak, log or retain. That matters most for the kind of file people are least willing to hand to a random converter site.
What is a .amf file, exactly?
Additive Manufacturing File — an application/x-amf format created by ASTM International since 2011. Created specifically to fix STL's limits: curved triangles, colour, multiple materials and explicit units, in compressed XML. 3MF later absorbed most of the role it was designed for.
Does the same viewer handle formats related to AMF?
Yes — the same engine also opens .dwg, .dxf, .fbx, so you can compare related files without switching tools.
Related formats
These open with the same engine, so if you have one of these sitting next to your .amf file, it will open too: