You've merged a report from five different files and now the page numbers are all over the place, or missing entirely. Or you've scanned a contract and the recipient wants every page numbered so nobody can claim a page went missing. Adding clean, consistent numbering to a whole document takes one click here, and nothing is uploaded: the numbers are written into the PDF on your own device.
Choosing a style
Pick where the number goes. Bottom center is the classic choice for books and reports; bottom right suits legal and business documents; top right is common for letters and academic papers. Then choose a format: a plain 1, Page 1, Page 1 of 12, 1 / 12 or – 1 –. "Page X of Y" is worth using for anything that will be printed or stapled: if a sheet goes missing from a bundle, the reader knows immediately. A live example under the options shows exactly what will appear before you commit.
Cover pages and custom starting numbers
Tick Skip the first page to leave a title page unnumbered, so numbering starts on page two. Use Start at when this PDF is part of something bigger: an appendix that should continue from page 41, a chapter that starts at 12, or a second volume that carries on from the first. The "of Y" total adjusts to match, so a document numbered from 41 with ten pages ends at "Page 50 of 50".
How the numbers are added
Numbers are written into the page as real text in a standard font, not stamped on as a picture. That means they print crisply at any size and stay searchable. The default margin keeps them clear of the page edge, which matters for printing: most office printers can't reach the last few millimeters of the paper. If your pages have content right at the edge, increase the distance from the edge, or move the number to a corner that's free. You can also change the size and color, and a mid-grey at 10 pt is discreet without being hard to read.
Works on rotated and mixed-size pages
Real-world PDFs aren't tidy. A scanned stack might have an A4 page, a landscape table and a sideways sheet all in one file. The numbers are placed relative to the page as you see it, so a landscape page gets its number in the correct corner even if the file stores it rotated. Different page sizes are handled one by one, so each page gets its number at the right distance from its own edge.
Getting the page order right first
Number the pages last. If the order might still change, sort that out first, because numbers are part of the page once they're added. Organize PDF lets you drag pages into place and Delete PDF Pages takes out the ones you don't need. If you're combining several documents, merge them first so the numbering runs continuously, and if double-sided scans need weaving together, Alternate & Mix PDF does that.
Numbering for printing and filing
- Printing two pages per sheet? Number first, then use Multiple Pages per Sheet, so each small page keeps its own number.
- Sending a draft? Add page numbers and a DRAFT watermark so reviewers can refer to "page 7" without confusion.
- Legal and contract packs: "Page X of Y" plus initials on each page, which you can add with Sign PDF, is the standard way to show nothing has been swapped.
- Long documents: if the file is large afterwards, compress it before you send.
Small details that make it look professional
Keep the same position and style across all your documents, so a client who receives several from you sees a consistent look. Avoid numbering a cover page, and consider starting body pages from 1 even if the file begins with a contents page, which you can do by skipping the first page and choosing the right start number. If the document will be bound on the left, bottom-right is the easiest corner to find when flipping pages.
Because the work happens in your browser, even confidential documents are safe to number here. The file is never uploaded, and the result downloads straight to your device.
A worked example
Suppose you're sending a 40-page grant application. The cover page shouldn't be numbered, the contents page should be page 1, and the budget annex, which you're attaching as a separate file, has to continue at page 38. Number the main file with "Skip the first page" ticked and the format "Page X of 37", then number the annex with "Start at 38". Both PDFs now read as one continuous document, and when you merge them with Merge PDF the numbers line up perfectly.
Printing tips
If the document will be printed and bound, leave a larger margin on the binding side, and put numbers on the outside corner: bottom right for right-hand pages. If you're printing double-sided, remember that odd pages are on the right. For quick duplex handouts, numbering the pages before printing two-to-a-sheet means each small page keeps its own clear number, which is a lot easier for an audience to follow.
If you later add or remove pages, the numbers need updating, so start again from the unnumbered original instead of numbering twice. Keep that clean master copy, and number a fresh copy whenever the document changes.