Private by design
The OBJ is read in your browser and never uploaded, so client work and unreleased sculpts stay on your device.
OBJ Viewer
Open Wavefront OBJ files in your browser, see every object, and check size and holes before you print. Nothing uploaded.
Loading 3D preview
Drag to rotate
Open a file to see its size, triangle count and whether it is watertight.
Opened in your browser. Files are never uploaded.
Continue with your OBJ
Pick the next tool for what you want to do with the file.
How to view an OBJ file online
Drop the .obj, inspect the mesh, then check how it would print.
- 1
Open the OBJ
Drop a .obj file. The .mtl and textures are not needed to view the shape.
- 2
Inspect it
Rotate, zoom and use wireframe to see the topology and how dense the mesh is.
- 3
Print it
Download it as an upright STL in millimeters when you are ready to slice.
Why use this OBJ viewer
The checks an OBJ needs before it goes to a slicer, in any browser.
Real size
OBJ has no unit, so the size is shown as millimeters, the way a slicer reads it.
Triangle count
Quads and polygons are split into triangles and counted, like a slicer would.
Watertight check
Holes and non-manifold edges, common in exports from modeling and scanning tools.
Volume and filament
Volume and a solid PLA weight estimate for quick costing.
Wireframe view
Show every edge to see where the mesh is dense and where it is coarse, before it slows your slicer down.
What's inside an OBJ file
OBJ is old, simple and supported almost everywhere. Four things to know about it.
Plain text you can read
Each line is one record: v for a vertex, vt for a texture coordinate, vn for a normal and f for a face. Faces can have three or more corners.
Materials in a separate .mtl
An mtllib line names a .mtl file that holds the colors and the paths to texture images. Without it the shape is complete but plain.
Objects and groups
Lines starting with o or g split the file into named parts. The viewer counts each one as an object, and OBJ to STL can save them as separate files.
No unit, no up axis
Coordinates are bare numbers. Most exporters write Y up, so the viewer stands the model Z up on the plate and reads the numbers as millimeters.
Who uses an OBJ viewer
OBJ is the common export of modelers, scanners and asset stores.
Modelers and sculptors
Check an export from Blender, ZBrush or Maya for size and holes before it goes to print.
3D scanning users
Open a photogrammetry or phone scan export and see how dense and how closed the mesh is.
Asset buyers
Preview a model bought or downloaded from a marketplace before you load it into a project.
Students and teachers
Open class files on a school computer or Chromebook where no 3D software can be installed.
OBJ viewer questions
Answers about the format, grey models, privacy, orientation and STL.
What is an OBJ file?
OBJ is a plain-text 3D format from Wavefront that almost every 3D program can read and write. It stores vertices, faces and texture coordinates, with materials in a separate .mtl file.
Why does my OBJ look grey?
Colors and textures live in the .mtl and image files next to the OBJ. The viewer reads only the .obj, which is all a print needs.
Is my OBJ uploaded?
No. It is opened in your browser and never leaves your device.
Why is my model sideways?
Most OBJ files are Y-up, so the viewer stands them upright on the plate. A file exported Z-up will appear lying down; it converts the same way.
Can I convert the OBJ to STL here?
Yes. Press Download STL for this file, or use OBJ to STL for batches and resizing.