ImBatch is a great free app that lets you modify multiple images, all in one go.This batch processing function is a real godsend, allowing you to resize, rotate, add shadow, flip, round corners and convert colors in multiple images in one single batch. ImBatch has various options, and not all of them have helpful alt text, so it might take a few goes to get to grips with it. Basically, add the images on the left (drag and drop or use the little add button), and specify the modifications on the right.
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