How can I bulk resize (to 1:1 aspect ratio) and add a black background to 4,000 images?

[Chris Maund]

Hi,Windowws 11 operating system.I have over 4,000 images that have been taken using 3:4 aspect ratio and in many cases cropped to remove background or superfluous space.I'm trying to get all photos to a 1:1 (square) aspect ratio by having a black background and then putting the resized image on top of that background.I have power tools installed but this only allows me to resize the image to change the background and aspect ratio.Apologies, I've tried loading example images but each time I get a "failed to upload" error message.Hope someone can help Chris

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