Join every page of a PDF into one continuous page, stacked vertically. The result is a single very tall page rather than a paginated document, which suits reading by scrolling and makes it straightforward to export the whole thing as one long image. It is not meant for printing - the resulting page is far taller than any sheet of paper.
Roughly the height of one page multiplied by the page count, so a 20 page document becomes a page about twenty times taller than the original. Some readers struggle with extreme page dimensions.
Not by reversing this operation - the page breaks are gone. Keep the original if you will need it paginated.
Yes - run this first, then PDF to Image, and you get a single tall image rather than one file per page.
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