This looks useful. I have some UI/UX suggestions.

Clicking on an image to view the detail feels like opening a modal, and I expected to be able to quickly go back to the initial canvas view by pressing the Esc key or clicking on the white background behind the image (rather than having to click on the cross symbol, which is a relatively small click target, especially on a large monitor).

Ideally the editing controls would be visible when viewing a single image, not just on the canvas view.

If the image labels are numbers, then the images are ordered, and it would be nice if the single-image view let you step between them using next/previous arrows, or arrow-key keyboard shortcuts.

This is amazingly slick, I have to say. I routinely run D&D-like RPGs out of PDFs over Zoom-like video conferencing apps, and often find myself screen-sharing to present graphics to my players: scenery, opponents, items, etc. In commercially published PDFs, these graphics are often embedded among game statistics or plot-relevant details that would spoil the story for players if they were to glimpse it on my screen, and it can be laborious to cut these out in a way that's safely presentable.

Tonight, though, I remembered I'd seen your tool here on HN and was able to, in seconds, copy+paste an image straight from Adobe Acrobat into Stylepad.

Very slick. So nice.

this is good, is there a story behind it?