This is the tidying job: a document that came out of a scanner in the wrong order, with two blank pages in the middle and one sheet fed in sideways.
The page list is the whole tool. Thumbnails at three sizes, because a hundred-page document and a six-page document want different views — compact when you are moving things around by position, large when you actually need to read a page before deciding whether to keep it. Dragging works as you would expect. So does the keyboard, which matters more than it sounds: reordering pages is one of the few operations that is genuinely hard to do without a mouse, and most tools simply do not let you.
Deleting is a selection followed by one action, not one page at a time. Rotating is a click, and it is written into the file rather than being a display trick — a page that looks right here looks right everywhere, including in print.
Selecting is where the speed lives. Shift-click takes a range, and the same three operations — delete, rotate, extract — work on one page or forty at once. State shows on the thumbnails themselves, so you can check the result as you go: a page you rotated shows rotated, a page with edits is marked, and a page that failed to render says so instead of sitting there blank. On a long document the list opens where you were reading, not back at page one.
Everything on this page is an ordinary edit, which means it steps back one at a time in the normal way. That is different from the whole-file tools like compressing, where the change rewrites everything and the escape is to start again from the original.
Nothing is uploaded. The document you opened stays untouched on your disk until you download the reordered version.