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I downloaded a model from someone but noticed the textures take up way too much space. Is there a way I can replace this images with lower quality images without having to replace them in the shaders?

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I suppose all the textures you're talking about are packed? What you could do is go in the File menu > External Data > Unpack All Into Files which will create a texture folder next to your file, replace all the high-quality images with low-quality, keeping the exact same name, then File menu > External Data > Pack All Into .blend.

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From the image editor, you can resize them:

enter image description here

If they are not packed in the blend file, save them after that.

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  • $\begingroup$ I didn't know that, too bad there is no "constrain proportions" option $\endgroup$
    – moonboots
    Dec 7, 2020 at 8:16
  • $\begingroup$ @moonboots, yes I agree. $\endgroup$
    – lemon
    Dec 7, 2020 at 8:18

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