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Yes, File size maybe increase, if you want shrink file size maybe you will find this helpful: https://bulkresizeimages.online/

so what does "ResizeImage" mean?

Resize could be ether dimensions or file size, resize is a bit （Homographic pun）

so does it use ai to scale up or something?

do not use ai，it just crop image， or adjust image dimensions and file size if bulk，it use in browser ability to complete the tasks