Q3O Converter
FileFlip converts Q3O files into 14 other formats entirely inside your browser, using Assimp compiled to WebAssembly. The Q3O file is never uploaded to a server: it is read off your disk, converted on your own machine, and saved back by the browser. There is no file-size limit and no account to create.
How do I convert a Q3O file?#
- Drop your Q3O file onto the converter at the top of this page, or click it to pick one from your computer.
- Choose the format you want out of it. FileFlip downloads the engine that conversion needs, once, and your browser caches it.
- Conversion starts the moment you pick the format, and the result is yours to download. The work happens in this tab, so nothing is uploaded and nothing is queued.
Is it safe to convert Q3O files online?#
Yes, because nothing is uploaded. FileFlip converts Q3O files inside the browser tab you already have open, using WebAssembly builds of the same engines a desktop converter would install. Your file is read from your own disk into the page's memory, and no request carrying it is ever made.
You do not have to take that on trust. Open your browser's network panel, run a conversion, and you will see the engine come down and your file go nowhere. There is no upload, no server-side copy, no retention window, and no account tied to what you converted.
How FileFlip works lists every engine, its version and its download size, and shows how to check for yourself that nothing leaves your machine.
What happens to a Q3O file#
FileFlip converts Q3O into 14 formats with Assimp, all of it inside the browser tab. Each conversion below names the engine it uses, what it downloads, and exactly what that conversion keeps or drops.
| Category | 3D Models |
|---|---|
| File extension | .q3o |
| FileFlip support | Read only, so it is a source rather than a target |
| Conversions available | 14 |
| Engines | Assimp |
| Downloaded to your browser | 11.2 MB on the first conversion, then cached |
What is a Q3O file?#
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".
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.
The Q3O file format reference covers the specification, the programs that open one, and what each conversion keeps or drops.
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.