How to view a .MTL file online
Three steps, no software to install.
Choose your file
Drag your .MTL file onto the box above. If it comes with companion files like .mtl, .bin or textures, drop them together with it.
It opens right away
Your .MTL file is opened and shown in 3D.
Inspect and measure
Rotate, switch views, toggle wireframe and check size, area and volume before printing.
What is a .MTL file?
Meshes, scenes and what "watertight" means for 3D printing.
An .MTL file is an OBJ Material File used for 3D image projects. It contains definitions for the visual properties and surface textures of 3D models. These files are typically opened using software such as Adobe Photoshop, TurboCAD, MeshLab, and Maya.
Programs that open .MTL files
| Full name | Material Template Library (Wavefront) |
|---|---|
| Developer | Wavefront Technologies (originator of the OBJ/MTL format; now part of Autodesk) |
| First released | Late 1980s (alongside the Wavefront OBJ format) |
| Category | 3D & CAD |
| MIME type | model/mtl |
Related viewers
Other free tools for engineering and visual files.
Is my .MTL file uploaded to your server?
No. Your .MTL file is rendered with WebGL.
Why is my OBJ model grey or missing textures?
OBJ keeps materials in a separate .mtl file and textures as images. Select or drop all of them together with the .obj and the viewer will link them up automatically.
How accurate are the volume and weight?
For watertight meshes the volume is exact for the triangles in the file. The weight assumes PLA at 1.24 g/cm³ and 100% infill, so a sliced print with lower infill will weigh less.
My model looks lying on its side. What now?
CAD and 3D-printing files usually treat Z as "up", while games and glTF use Y. Switch Up: Y / Z in the toolbar.
Can I open STEP or IGES files here?
Those are CAD formats that store exact surfaces rather than triangles. Open them in our CAD Viewer, which converts them to a mesh.
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