Quick3D Object .q3o
Quick3D’s own format, from the model-viewing utility.
What a .q3o file holds
Q3O and its scene variant .q3s are the native formats of Quick3D, a Windows utility built for viewing and converting between the many competing 3D formats of its era. Files in it are usually the by-product of somebody else’s conversion.
Also seen as .q3s.
Commonly seen in: Quick3D, legacy conversion pipelines.
| Data | Stored in Q3O |
|---|---|
| Geometry | Yes |
| Materials and colour | Yes |
| Texture maps | Yes |
| Animation and rigs | No |
| Scene hierarchy | Yes |
| Read here | Yes |
| Written here | No |
Tested against a real file
The last sweep loaded WusonOrange.q3o from Assimp test models with its 1 sidecar files through the viewer on this site: 3,732 triangles across 1 meshes and 1 materials, in 2.2 seconds. Every format's result is on the test results page, run 2026-09-08.
Convert Q3O to another format
Every pairing has a page saying what survives the trip.
Other things to do with a .q3o file
Questions about Q3O
How do I open a .q3o file?
Drop it into the viewer on this site and it opens in the browser, with the scene tree, the materials and the mesh statistics. Nothing is uploaded. If you want it in another program instead, convert it to GLB, which almost everything reads.
Is Q3O a good format to archive in?
Q3O stores geometry, materials and colour, texture maps, scene hierarchy. Anything outside that list will not be in the file at all, so archive the original alongside it if the surfacing or the rig matters.
Does converting Q3O lose quality?
Geometry is copied vertex for vertex, so the shape does not degrade. What gets lost is whatever the target format has no field for: convert to STL and the materials go, convert to OBJ and the animation goes. The comparison table on each converter page says exactly which.
Formats that hold the same things
Or go back to the full format reference.