Open 3DM files online
3DM is the openNURBS model format from Rhinoceros (Rhino 3D), used for complex curved-surface architecture and product design. The viewer loads it with the official rhino3dm WebAssembly library and Three.js.
Drop a 3DM file to open it
or click to choose — everything stays on your device
Choose file🔒 100% private — files never leave your browser
Or turn 3DM into an image — snapshot the preview, add arrows or notes, and download a PNG.
What is a 3DM file?
3DM is the openNURBS model format from Rhinoceros (Rhino 3D), used for complex curved-surface architecture and product design. The viewer loads it with the official rhino3dm WebAssembly library and Three.js. The .3DM extension identifies a openNURBS 3D Model file, which is served with the model/3dm media type. You can open it here instantly — drop the file into the box above and it renders in your browser. Nothing is uploaded.
Besides this free online viewer, you can open Rhino 3D (3DM) files in desktop apps such as Rhinoceros, Autodesk Fusion, Blender (plugin) — but here all you need is a web browser.
Quick facts
| Format | Rhino 3D (3DM) — openNURBS 3D Model |
|---|---|
| File extensions | .3dm |
| MIME type | model/3dm |
| Developer | Robert McNeel & Associates |
| Category | 3D, CAD & GIS |
| Also opens in | Rhinoceros, Autodesk Fusion, Blender (plugin) |
How to open a 3DM file online
- Click Choose file above, or drag your 3DM file onto the box.
- The right viewer loads automatically and renders your file.
- Read, scroll or page through it. To open a different file, choose Open another file.
100% private — files never leave your browser.
Libraries used to render 3DM in the browser
This viewer is built entirely with open-source JavaScript that runs in your browser:
Frequently asked questions
What is a .3DM file?
A .3DM file is a openNURBS 3D Model, identified by the model/3dm media type. You can open and read it instantly in the viewer above without installing anything.
What programs open 3DM files?
On the desktop, 3DM files typically open in Rhinoceros, Autodesk Fusion, Blender (plugin). Online, this page opens them in any modern browser — nothing to download.
How do I convert 3DM to an image?
Use Snapshot to capture the 3DM preview, optionally add arrows, text or highlights, then download it as a PNG image.
Is it safe to open my 3DM file here?
Yes. The file is read and rendered entirely by JavaScript inside your own browser. It is never uploaded to a server, so nothing leaves your device.
Do I need to install anything to view a 3DM file?
No. There is nothing to install and no account to create. Open the page, drop your file, and it displays instantly.
Does it work on my phone or iPad?
Yes. The viewer is fully responsive and works in modern mobile and tablet browsers such as Safari and Chrome.
Is there a file size limit?
There is no hard limit, but very large files depend on your device’s memory. Big files are processed in the background so the page stays responsive.