OBJ viewer
Drop a 3D file here
STL, 3MF, OBJ, PLY, GLB or G-code. The file opens in this browser tab and is not uploaded.
- File
- –
- Size (mm)
- –
- Volume
- –
- Triangles
- –
Measure it, cut a section, estimate the print
The free Extrude app does this on your phone, offline. Listed as “STL Viewer”.
What is an OBJ file?
OBJ is a plain-text 3D format from Wavefront, used by Blender, Maya, ZBrush and most scanning apps. It stores vertices, faces and texture coordinates.
Colours and textures are kept outside the OBJ, in an .mtl file and image files next to it. Many download sites bundle all of them in a ZIP.
How to use this viewer
- Drop the file on the dark area, or press Choose file.
- Drag to rotate, scroll or pinch to zoom, right-drag or two-finger drag to pan.
- Read the size, volume and triangle count under the view. Use Wireframe to see the mesh.
Opening OBJ files on a phone
The app opens OBJ files on its own or inside a ZIP, and can export any model as STL for printing.
Questions
Can I convert OBJ to STL?
Yes. The Extrude app exports any model it opens as a binary STL in millimetres, ready for a slicer.
Why is my OBJ grey?
Colour and texture are stored in a separate .mtl file and images. The viewer shows the shape only.
Is the file uploaded?
No. It stays in your browser.
Other viewers
Every page opens every format. These cover what is different about each one.