How to Add Page Numbers to a PDF
Page numbers are one of those things nobody notices until they're missing. Then you're on a call saying "go to the page with the blue chart — no, the other blue chart," and everyone quietly resents the document. Adding numbers to a PDF takes a few minutes, and which method you pick depends on one question: how long is the document?
Method 1: Free browser editor (best for short documents)
For anything under ~15 pages, stamping numbers by hand is fast and free:
- Open PDFPax Edit PDF.
- Drop in your PDF and add a text box at the bottom of each page with its number.
- Keep the position consistent — bottom center or bottom right — and use the same font size throughout.
- Download the numbered PDF.
Let's be honest: this is manual work, and nobody should hand-number a 90-page report. But for a 6-page assignment, a short contract, or a portfolio, it takes five minutes and costs nothing. If you're numbering a document someone else will print, keep the numbers at least a centimeter from the page edge — home printers with narrow margins love to eat footers. Pro tip: number after you've finalized the document — nothing is more annoying than renumbering because you inserted a page. If you're still assembling the file, merge everything first, then number.
Method 2: Adobe Acrobat (automatic, paid)
Acrobat does this properly, in bulk:
- Open the PDF and go to Tools > Edit PDF > Header & Footer > Add.
- Click in the footer section where you want the numbers, then click Insert Page Number.
- Adjust the font, size, and margins, set the starting number, and apply.
This numbers every page at once, handles "Page X of Y" formatting, and lets you start numbering from a specific page (so the cover stays clean). If you number long PDFs regularly, this is the feature that justifies Acrobat. For everyone else, read on.
Method 3: Fix it at the source (best for documents you created)
Here's the method people forget: if you made the document in Word or Google Docs, add page numbers there and re-export the PDF. In Word: Insert > Page Number. In Google Docs: Insert > Page numbers. This gives you automatic, perfectly consistent numbering — and it stays correct if you edit and re-export. Numbering a PDF directly should be a last resort for files you didn't create, like scans or someone else's export.
Numbering etiquette (yes, it's a thing)
- Skip the cover page. Professional documents start numbering on the first content page. In Acrobat you can set the start page; manually, just don't stamp the cover.
- Bottom center or bottom right. These are the conventions readers expect. Top corners are for headers, not page numbers.
- Don't fight existing numbers. Some PDFs (books, papers) already have printed page numbers that differ from the PDF page count. Adding a second set creates confusion — decide which one is the reference and say so.
- Mind the margins. Numbers crammed against the edge get cut off by some printers. Keep them comfortably inside the page.
Finishing a document for submission? Pair numbering with a quick compression pass so the file sails under upload limits — our compression guide walks through it.
FAQ
Can I add page numbers to a scanned PDF?
Yes — stamping numbers onto scanned pages works exactly the same as on digital ones, since you're just overlaying text. The scan quality doesn't matter for this task.
Will the numbers move if someone edits the PDF?
Stamped numbers are static text on each page, so they stay put. (That's also why you should number last — insert a page and everything after it is wrong.)
How do I number only some pages?
With the manual method, just stamp the pages you want. In Acrobat's header/footer dialog, set a page range so numbering starts where you choose.
Short document? Number it free with PDFPax Edit PDF — no sign-up, and your files never leave your device.