Short answer
To add page numbers to a PDF, switch this tool to page-number mode, choose your file, and download — each page gets a number at the bottom. It runs entirely in your browser, so nothing is uploaded.
Page numbers make long PDFs — reports, contracts, manuscripts — easy to reference and reassemble if printed. Numbers are drawn as a clean text layer, so the original content is untouched.
As with everything in this suite, your document is processed locally and never uploaded.
Centered at the bottom of each page, formatted like '1 / 12'.
No — page numbers are added in your browser.