Open and view 3MF files online — free, no signup, no upload
A 3MF file (3D Manufacturing Format) is a modern, ZIP-based 3D-printing format that carries colour, materials and real-world units — richer and less error-prone than STL. This viewer opens 3MF files right in your browser so you can rotate, zoom and pan a model and check its bounding-box dimensions and triangle count — without installing software or sending your file anywhere.
How to view a 3MF file
1. Drag your file onto the box above, or click Open 3MF file. 2. Drag to orbit, scroll to zoom, right-drag to pan. 3. Read the width/depth/height and triangle count in the panel.
Frequently asked questions
How do I open a 3MF file online?
Drag your .3mf onto this page or click Open File — it renders instantly in your browser. Nothing is uploaded.
Is 3MF better than STL?
3MF stores colour, materials and units that STL can't, and is less prone to broken meshes. This viewer reads the model geometry from the .3mf directly.
Is my 3MF uploaded anywhere?
No — the viewer is fully client-side; your file stays on your device.
What do the dimensions show?
The bounding-box width, depth and height (3MF carries millimetre units), plus the triangle count.