Yeah all paint/photo programs can resize and give you what the file size will/can be. The major difference with KissMyImage and that you tell it how large the file is allowed to be in weight (kb).
You tell it say 900x720px and 150kb max (each) it will batch your complete folder to meet that rule (or whatever size you feel is correct). As far as I know this is the only program that can do this.
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