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Batch action, Image Processor. Both are core Photoshop functions and will do what you want. Both can also be launched from selected files in Bridge.
Oh thank you! You "saved my life" :-D
With the Batch command you need to think a bit in advance to avoid confusion with original / copy. Do you want to save out the copies to a separate folder, keeping the originals unchanged? Or do you want them in the same folder, replacing the originals?
If you save out to a different file format you always get a separate copy. Saving out to jpeg won't replace the png.
You should also be aware that jpeg is a destructive format and every new resave degrades the image a bit (lots of people don't know that). So it's not recommended to keep jpegs as master files. Saving out to jpeg should only be done once, at the very end.
Thank you for your answer and help! I am creating clipart and I always make the original in png and in the last step I also make a copy of the png in jpeg-format. I sell the files in both png and jpeg (I deliver both file-types to the customer). I tried the batch process and it worked wonderfully. This saves me much time (and effort). I always save the original file in png.