How to rearrange PDF pages
Open Reorder PDF pages, add your file, drag the thumbnails into order, press Start and download. Reverse order flips the whole file in one click.
Fixing a double-sided scan
If fronts and backs came out as separate files, add both to Merge PDF. Its page board shows every page, so you can drag them together in order before you save.
Moving one page a long way
Dragging across a long file takes a while. Use the arrows for small moves. For big jumps, split the file at that point and merge the parts in the new order.
Before you share it
Scroll through the thumbnails once more, and keep your original. Bookmarks, form fields and internal links may not carry over, so check them if your file has any.