Perhaps your PNG makes more sense as a JPG, this can’t help. It keeps whatever format it’s currently in.So if you drop a 437px image into a service that scales to 1000px, it’ll scale up which you almost certainly don’t want. Done! Now it’s available as a service for any file in the Finder no matter where it is. I like calling it something super obvious (to me), like simply “500” or whatever the max size of the scaling is.

In my case I’m scaling the images for the web, so of course I want them to be as optimized as they can. You probably do, so you can keep the original in case it doesn’t turn out how you want. It will ask if you want to make a copy of the image or not. I like services since I can use them from the context menu anywhere.

Or a hot folder you can just drop things into. You might prefer an app that you can drag things onto. Turns out it’s a pretty easy thing to do, at least in a limited way. AppleScript, perhaps? Photoshop scripts? Some already existing little app? A little pontification on Twitter resulted in a number of suggestions to try OS X’s Automator. As I was using Photoshop to resize my eleven billionth image, it occurred to me I should probably simplify this process.

Automator mac workflow screenshots