This tool loads your PDFs entirely in your browser using pdf.js and pdf-lib, two open-source libraries - nothing is ever sent to a server. Add one or more files to combine them into a single reorderable page list: drag pages into a new order, rotate or duplicate them, insert blank pages, or delete the ones you don't need. Click any page to add text, a stamp image, or a freehand drawing (also handy for a quick signature) directly on top of it, then export the result as a new PDF.