How it works
Drop in a PDF and every page appears as a thumbnail. Drag pages into a new order, use the turn button on a page that is sideways, and the bin to remove one. Add more PDFs or pictures to insert their pages too. Press Save PDF when it looks right.
From the keyboard
Tab to a page and press Alt with an arrow key to move it one place. The page's buttons work with Enter.
Questions
Will the text still be selectable?
Yes. Pages are moved, not redrawn, so text, links and quality are exactly as they were.
Is my file uploaded?
No. Everything happens in this page, on your device.