To convert an OBJ to GLB, run the whole OBJ bundle (the .obj, its .mtl, and the texture images) through a converter or a 3D tool’s export, and it produces a single self-contained .glb. The point is to turn a multi-file model into one web-ready file. Check the original in the OBJ viewer and the result in the GLB viewer.
Here is what to expect.
Why people make this switch
OBJ is the universal exchange format, exported by nearly every 3D tool, but it has two limits for modern use. It travels as several files, and it does not carry animation. GLB fixes both for web and real-time work: it bundles geometry, materials and textures into one file, and it is the format browsers, game engines and AR expect. The fuller comparison is in GLB vs glTF.
Convert the whole bundle, not just the .obj
This is the step people miss. An OBJ stores only geometry; its colours and materials live in a companion .mtl file, which points to image textures. To keep the look of the model, the converter needs all of those files in the same place. Feed it the lone .obj and you get a GLB with the right shape but a blank, neutral material.
There are several free OBJ-to-GLB converters online, and most 3D modelling tools can import an OBJ and export a GLB directly. Whichever route you take, gather the .obj, .mtl and images first.
Check the result
After converting, open the new .glb in the GLB viewer. Confirm three things: the shape matches the original, the dimensions look right, and the textures came through rather than showing a plain grey material. If the model is now lighter than you need, see reducing a 3D model’s file size.
Inspect both, locally
Both viewers run in your browser and never upload your files, so you can compare the OBJ and the finished GLB side by side without anything leaving your device. Start with the GLB viewer.