One field, three jobs
In Pages to keep mode, the order you type is the order you get — entering 3,1,2 doesn't just keep those three pages, it puts page 3 first, page 1 second, and page 2 last. That's the trick this tool leans on: reordering is just "keep everything, but in this order."
Pages to delete mode is the plainer option when you just want a few pages gone and everything else left in its original order.
Common questions
How do I reorder pages?
Use "Pages to keep" and type the page numbers in the order you want them to appear, such as 3,1,2. The output PDF follows that exact order, which means this one field can keep, drop and reorder pages all at once.
What's the difference between the two modes?
"Pages to keep" builds the new PDF from only the pages you list, in the order you list them. "Pages to delete" does the opposite — it keeps everything except what you list, in the original order.
Is my PDF uploaded anywhere?
No. Pages are copied entirely in your browser using a JavaScript library. Nothing is sent to a server.