Runs on your device · Your file never leaves your device.
Drop a model and choose what to turn it into. Ten formats can be read — GLB, glTF, OBJ, STL, PLY, FBX, Collada (DAE), 3MF, AMF, VRML and USDZ — and six can be written: GLB, glTF, OBJ, STL, PLY and USDZ. The file is read, rebuilt and written on your own machine; nothing is sent anywhere, which matters more here than almost anywhere else on this site, because a 3D file is usually a client’s product, a scanned building or an unreleased design.
If your model came with companion files, add them in the same go. An OBJ keeps its colours in a separate .mtl file which in turn points at texture images; a .gltf keeps its geometry in a .bin beside it. Add all of them together and the result is complete — leave them out and you get correct shapes in plain grey, which is the single most common complaint about 3D converters that only accept one file at a time.
What each format can hold is not the same, and the tool says so before you download rather than after. STL stores shape and nothing else, so colour and animation cannot travel with it — that is the format doing its job, since STL exists for 3D printers that only need the shape. PLY carries colour per point rather than as an image. OBJ holds one still shape. GLB and glTF are the only two here that carry animation, and they carry it faithfully.
How to convert a 3D model
Drop the model — and its .mtl file and textures if it has them.
Not for: Writing FBX, Collada or 3MF, and CAD formats such as STEP, IGES or SolidWorks parts — those are solid-body formats rather than meshes and need a CAD kernel, not a mesh converter.
Frequently asked questions
Are my files uploaded to a server?
No. This conversion runs entirely inside your browser using your own device’s processing power. The file never leaves your computer or phone, which is why it also works when your connection drops.
Why is my model grey after converting?
Its colours were in files you did not add. OBJ keeps materials in a .mtl file and the images it names in separate .jpg or .png files. Press Add more files and include them, then convert again — the shapes were always right, only the surface was missing.
Can it write FBX, or Collada, or 3MF?
No, and the picker will not offer them. Those three can be read but not written, because no browser-side writer for them exists that would produce a file your 3D program could trust. Rather than hand you something that half works, the tool only offers what it can finish: GLB, glTF, OBJ, STL, PLY and USDZ.
Do animations survive?
To GLB and glTF, yes — the clips are carried across intact. To OBJ, STL, PLY and USDZ, no, because those formats have nowhere to put them. You are told which it will be before you download.
Which format should I pick?
GLB for the web, for AR and for sending one self-contained file to somebody. STL for 3D printing. OBJ when another program needs something old and universal. USDZ for Quick Look on an iPhone or iPad. glTF when you want the same thing as GLB but as readable text you can inspect or edit.
How large a model can it handle?
Tens of megabytes are comfortable on a normal laptop; a phone will manage less. The limit is the memory your browser can give one tab, not the format. A model too dense to open is reported as exactly that rather than failing silently.