Convert Blend file to GLTF with baked materials I am trying to convert MMD files into gltf files for use on the web. I use a plugin called https://github.com/powroupi/blender_mmd_tools to import them into blender, but when I export them, they don't keep their textures. I understand that this happens because the generated materials use complex nodes, so I was wondering if there was a quick way to flatten all materials into a simple unlit material.

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The preferred material setup is described in the Blender glTF addon docs. You can use a process like How do I bake a texture using Cycles bake to bake a diffuse texture (or other things) which are compatible with that setup.