To add page numbers to a PDF, open a browser-based tool, choose where the number goes (any corner, top-centre, or bottom-centre) and a format — plain numbers, "1 of N", or "Page 1" — and download the numbered file. It runs on your device, so the PDF is never uploaded. Numbers are added as new text over the page; existing content is untouched, with no sign-up and no watermark.
Page numbers make a long PDF easier to reference, cite, and print in order. Here is how to add them without uploading the document, and which options you have.
Related tools:
Six positions are available — any corner, top-centre, or bottom-centre — in three number formats: plain numbers (1, 2, 3), "1 of N", and "Page 1". Numbering runs one-to-N across the whole document; custom start numbers and per-section numbering are not supported yet. Numbers are drawn as new text over each page, so the original content is left exactly as it was, and a password-protected PDF must be unlocked first.