Add page numbers to a PDF, free

Adding page numbers with Unido means drawing each page's number directly on top of its content, using Helvetica — one of the 14 standard fonts every PDF reader (Adobe Reader, browsers, mobile viewers…) already has built in. That's why no font file needs to be embedded in the document: simply referencing "Helvetica" is enough for it to display correctly in any program.

Technically, this tool appends a small piece of new content — the page-number text, positioned based on that page's own size — to the end of each page's existing content, instead of replacing anything. The original text, images, and graphics in your PDF stay untouched; the page number is added on top, at the position you choose.

You can pick the format: "1 / 12" shows the page number together with the document's total page count, while "Page 1" shows just that page's number, preceded by the word "Page". And you can pick the position: centered at the bottom of the page, or in its bottom-right corner.

One honest limitation: the number is placed using each page's own internal coordinates, assuming the usual (0°) orientation. If your PDF has pages that already carry a rotation, the number may not land exactly at the visual bottom once the viewer applies that rotation — an uncommon case, but one we'd rather explain clearly than promise a precision this version of the tool doesn't guarantee for it.