A quarter turn does not straighten a sheet that went crooked through the feeder. Set the angle to a tenth of a degree and save.
What it does not do: The angle is not guessed: you find it, the tool does not detect which way a document leans. And a quarter turn here is not the one “rotate” does: on a page that is not square, keeping the size cuts off almost a third of it. The pages are redrawn: clickable links, bookmarks, form fields and accessibility tags do not survive. And what falls outside the frame stays in the file without being shown, as with cropping: an editor can bring it back.
Nothing is uploaded. Cut your network connection once this page has loaded: the tool keeps working. How to check it yourself.