I got this app (for $5!) because I needed to convert 67 50+MB HDR TIFFs to 4MB JPGs. I downloaded it, ran it, drag-and-dropped my files onto it, set a scale action, set a scale action to 50% and hit the button. BOOM! 67 smaller files on my disk. I thought I’d try having it upload them to flickr for my wife. Added my flickr account to “Internet Accounts”, selected Convert & Share, hit Flickr, and… BOOM! 67 files on Flickr (OK, it took 8 minutes to upload them).
Does what I need it to do — fast!
NoOneOfConsequence about PhotoMill: The Image Converter