Retrobatch makes batch image processing very easy with its node-based setup—where each "node" represents a specific action (like resizing or adding watermarks) that you can chain together—once you get the hang of it, it’s a huge time saver for organizing, converting, and refining either a single or tons of images at once. It’s also a very well-engineered app, created by the same developer behind the popular Acorn image editor. Great purchase!