How to Add Page Numbers to a PDF
A tender submission, a thesis appendix, a 60-page contract merged from five files — and a requirement that every page be numbered. If you still have the Word file, number it there. If all you have is the PDF, you can stamp numbers onto it directly, and a few decisions up front save you from doing it twice.
If you have the source document, start there
Word, Google Docs, Pages and LibreOffice all have Insert → Page Number. Numbers added at the source move with the text when you edit, can use different styles per section (i, ii, iii for front matter, then 1, 2, 3) and never overlap content, because the layout makes room for them. Export to PDF afterwards. Stamping numbers onto a finished PDF is the right tool when there is no source — scans, merged files, documents from other people.
Your options for an existing PDF
In the browser, free
The Add Page Numbers tool on this site stamps numbers with pdf-lib inside your browser. Choose the format, position, size, margin, colour, the page to start on and the number to start from, and preview each page before saving. The file is not uploaded.
Adobe Acrobat (paid)
Edit a PDF → Header & Footer → Add. Full control, including Bates numbering for legal work. The free Acrobat Reader cannot do it.
Preview on a Mac
Has no page-numbering feature. Use one of the other options.
Microsoft Word
Can open a PDF and convert it to an editable document, then you add numbers and export again. Works for simple text documents; complex layouts often shift.
Decisions to make before you click
Format
A bare 7 is fine for books and reports. Page 7 of 20 is the safest choice for anything that will be printed and handled separately — contracts, submissions, faxes — because a missing sheet is obvious from any page.
Skipping the cover
Convention says a cover page carries no number. You have two different choices here, and tools differ on which they offer:
- Start numbering on page 2, beginning at 1. The page after the cover reads "1". Common for reports.
- Start numbering on page 2, beginning at 2. The cover counts but is not marked. Common for academic work, where the title page is page 1.
Check what "of 20" counts. In our tool the total is the number of pages that get a number, so skipping a cover in a 20-page file gives "Page 1 of 19". If your guidelines count the cover, start at 2 instead and the totals line up.
Position
Bottom centre is the neutral default. For documents printed double-sided and bound, outer corners (right on odd pages, left on even) are easiest to flick through — though most stamping tools, ours included, use the same position on every page, so bottom centre is the practical choice there. Keep the margin generous: many scans and exported slides have content right to the edge, and a number stamped over a footer looks careless. Preview the busiest page, not just the first.
Problems you might hit
| Problem | Cause and fix |
|---|---|
| Number sideways or in the wrong corner on landscape pages | Many landscape pages are portrait pages with a "rotate 90°" flag. Tools that ignore the flag stamp the number in the page's unrotated corner. Ours positions it on the page as you see it. |
| A digital signature became invalid | Any change to a signed PDF breaks the signature — page numbers included. Number first, then sign. |
| Numbers in the wrong order | The pages are in the wrong order. Fix that first with a reorder tool, then number. |
| Password-protected PDF | Files with an open password need unlocking first; files with only editing restrictions may still be refused by some tools. |
A sensible order of operations
- Merge the parts into one file.
- Remove blank or duplicate pages and reorder what's left.
- Rotate any pages that read sideways.
- Add page numbers.
- Add a watermark if needed, compress if it must fit an upload limit, and sign last.
Numbering after every structural change means you only do it once.
Number your PDF pages — free, in your browser