Court filings, dissertations, and printed handouts all want numbered pages — and most PDF generators forget them. This tool stamps clean page numbers (or "Page N of M") onto every page at the position you choose, without uploading the document anywhere.
Numbering is applied by pdf-lib in your browser tab — the document itself never leaves your device.
Yes — set "Start at" to any number, useful when the document continues from another volume or you want the cover page uncounted.
They are placed in the bottom margin, where standard documents leave space. Pages with unusually full bleeds may need the left or right position instead.