How do I unpack unused or unwanted textures from a Blender file?

Support Materials and Textures
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After checking the “automatically pack into .blend” in the files tab, it saves all textures you use into the that blend file.

How do I unpack/remove a texture?

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unpack_im_blender
unpack_im_blender653×525 24.5 KB

Under the image category (tab) in the Image Editor sidebar you will see a unpack button, next to the image path.

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If you don’t want that image saved/packed you shift click the x and re-save/pack.

unlink-data

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I’ve never used auto-packing so didn’t know there was an option. Just read the manual and found more detail. You probably need to disable auto-packing.

https://docs.blender.org/manual/en/2.92/files/blend/packed_data.html?highlight=use%20autopack