To export a 3D model, first import the source file (e.g., .obj, .fbx) into 3D software (like Blender or Maya), then use the software’s export function to convert it to your desired format.
Importing lets you adjust the model—fix meshes, check textures, or optimize geometry—so it works for your use case (e.g., GLB for web AR, STL for 3D printing, FBX for games).
For beginners, Blender is a great choice: use "File > Import" to load your model, confirm it looks correct, then export directly via "File > Export."