Q3O File Format (.q3o)
A Q3O file stores a single 3D object, its mesh, materials and texture data, in the format written by Quick3D, an older Windows viewer and converter application identified in the file by the signature string "quick3Do".
Q3O at a glance#
| Full name | Quick3D object |
|---|---|
| File extension | .q3o |
| Category | 3D Models |
| Compression | Uncompressed |
| FileFlip support | FileFlip reads this format but does not write it |
What a .q3o file can hold#
These are the things a Q3O file either supports or does not, and they are what decides whether a conversion keeps everything or quietly drops something.
| Textures and materials | Yes |
|---|
Strengths and limitations of Q3O#
What Q3O does well
- Self-contained: mesh, material colours and texture image data all sit in the one file
- Simple enough that a handful of format-conversion libraries still parse it decades later
Where Q3O falls short
- Quick3D itself is long out of circulation, so there's no current vendor documentation to check a parser against
- No animation or skeleton data, only a single static mesh with materials
- Effectively unsupported outside a small number of legacy conversion tools
There's little reason to create a new Q3O file today; it only comes up when an old Quick3D asset needs to be read.
Convert Q3O to OBJ or glTF as soon as the model needs to open anywhere other than Quick3D itself.
How to open a .q3o file#
A .q3o file opens in the programs below, grouped by the platform you are on. If you would rather not install anything, FileFlip converts Q3O into a format your machine already opens, and it does it in the browser tab rather than on a server.
| Platform | Programs that open it |
|---|---|
| Web | FileFlip |
Q3O questions people ask#
What is a Q3O file?
A Q3O file is a single 3D object saved by Quick3D, an older Windows application for viewing and converting 3D models. It stores one mesh with its materials and textures, identified internally by the signature "quick3Do".
What's the difference between Q3O and Q3S?
A Q3O file holds one object, while a Q3S file is Quick3D's scene format, holding several objects along with cameras, lights and their arrangement. A Q3S file typically references multiple Q3O-style objects rather than duplicating their geometry.
What software still opens Q3O files today?
Quick3D itself is no longer in active circulation, so a Q3O file today is almost always opened through a format-conversion library that has kept support for it rather than the original application.
Converting Q3O files#
Convert Q3O to another format
FileFlip does not write .q3o files, so nothing on the site converts into this format. It works as a source only.
Every conversion runs inside your browser. The file is read from your disk, the work happens on your own machine, and nothing is uploaded. How FileFlip works names the engine behind each family and how to verify that for yourself.