Really cool, thank you for your work. Some suggestions:
Sometimes I'll be running a batch of images and it will randomly error when a background process uses too much GPU or something like that, and then I lose my place. What do you think of adding a "resume" button, or even better, a way to have it retry on its own so I don't have to watch it?
Also, it doesn't clean up the resized files of finished images after it errors. Maybe it will be better to remove the resize files after each image is done, rather than all at the end, to keep disk space free.
Looking forward to more from you!