Page numbers are a small feature that quietly carries a lot of weight in formal documents - agreements, reports and manuals all assume them. Adding numbers to a PDF is fast, but doing it smartly means thinking about position and which pages should stay unnumbered.
Choosing how the numbers look
Position and style
Page numbers usually sit in the bottom centre or bottom right corner, where readers look first. Choose a font size small enough not to compete with body text and keep the style plain - no bold or colour - so numbering reads as metadata, not content. Some tools start numbering at any page you choose and can add a prefix like a document code.
Which pages should stay unnumbered
A title or cover page almost never carries a number. Starting the visible count at page 2 or 3 is standard for reports. In agreements, the count often begins at the operative clause page, leaving the signature page numbered so parties can reference a specific page.
Offset numbering for clean rollups
If a document is a chapter pasted into a larger file, its internal page numbers usually restart rather than continue. The offset feature sets the first printed number (say 1) even though the physical page is actually number 40 in the combined file. This keeps each appendix self-consistent.
What can go wrong
- Scanner-generated PDFs - page numbers overlaid on an image can overlap dark areas; check contrast.
- Mixed orientations - a landscape page gets its number sideways in some layouts.
- Duplicated numbers - numbering an already-numbered document leaves two numbers per page. Remove the old ones or pick a different corner.
Example walk-through
Twenty pages of a submission, cover excluded, gain numbers 1-19 by setting the start page to 2 and the starting number to 1. Run the Add Page Numbers tool, preview the first few pages, then check the cover shows no stray digit. To assemble the numbered pages with an annex, Merge PDF handles the final step.