How to Add Page Numbers to a PDF

A PDF does not know what page it is on. Scroll to the fourth sheet of a report and the viewer says 4 of 20, but that number lives in the toolbar, not the document - print it and the number is gone. Anyone reading a stapled stack, citing a paragraph in a meeting or putting a dropped pile back in order needs it on the paper. This guide covers how to put it there, where it should sit, and how to handle a cover page.

Why the numbers are not already there

Word and Google Docs keep page numbers in a header or footer - a running element the program repeats and renumbers as you edit. Exporting to PDF throws that machinery away: whatever the footer showed is flattened into each page as ordinary text at fixed coordinates. If no footer was set up, the pages come out bare, and there is no setting inside the file to switch on.

Adding numbers to a finished PDF therefore means drawing new text onto every page. That is what Add Page Numbers to PDF does: it opens the file, measures each page, and stamps a number where you choose, leaving the existing content untouched beneath it.

How to add page numbers to a PDF

1. Open the Add Page Numbers tool and drop your PDF onto the page. The file name, size and page count appear, so you can confirm the right document loaded.
2. Pick a position - one of six, from bottom centre to top left.
3. Pick a format: a bare number, "Page 1", "1 of 10" or "Page 1 of 10".
4. Set the starting number, font size and margin, and tick Skip the first page if page 1 is a cover.
5. Click Add page numbers and download. The result is saved as numbered.pdf.

A line under the controls previews the first numbered page as you change the settings, so you can check it reads "Page 1 of 9" rather than "Page 2 of 10" before committing. Your original file is never modified.

Where to put the number

Six positions are offered, and the choice depends less on taste than on what happens to the document afterwards.

• Bottom centre, the default, is safest for anything read on screen or printed single-sided. Being symmetrical, it looks the same whichever way the pages are bound.
• Bottom right is the convention for reports printed double-sided - the outer edge of a right-hand page is where a thumb finds it while flicking through.
• Top right suits documents that live in a binder, since the corner stays visible when pages are clipped together.
• Avoid the top positions if your pages carry a running header, and the bottom ones if there is a footer - the number is drawn on top of whatever is there, not around it.

Which format to use

The bare number is the least intrusive and the right default for a long document read straight through. "Page 1" is mostly useful when the page carries other stray numbers - invoice figures, clause numbers - and the page number needs to be unmistakable.

The two "of" formats earn their keep on anything printed and handed over: "1 of 10" tells a reader that no page is missing, which is why it is standard on contracts, tenders and anything with a page limit. "Page 1 of 10" says the same thing and is the widest of the four - worth remembering if your margins are tight.

Covers, and starting at a number other than 1

Two settings handle the cases that trip people up. Skip the first page leaves page 1 unstamped - useful for a cover that should stay clean - and it also renumbers what follows. Take a 10-page report with a cover, set to "Page 1 of 10" and skip the first page: the cover comes out bare, the second sheet reads "Page 1 of 9", and the last reads "Page 9 of 9". The cover drops out of the count as well as the numbering, which is what a reader checking for missing pages expects.

Start numbering at handles the opposite case: a file that is one section of something longer. For a 10-page appendix following 4 pages of front matter, set the start to 5 and choose "1 of 10" - the first page reads "5 of 14" and the last "14 of 14". The total describes the whole document, not the file in front of you.

Font size and margin: a worked example

Both sliders work in points, the PDF unit: 72 to the inch, so 28pt is about 9.9mm. The font size runs from 7pt to 24pt and starts at 11pt, roughly body-text size. Drop to 8 or 9pt for something discreet; go past 16pt only for large-format pages.

The margin is measured from the page edge to the baseline the digits sit on. At the default 28pt on an A4 page - 595 by 842 points - a bottom-centre number sits 28pt above the bottom edge, comfortably inside the 1-inch margin a Word document typically leaves, so it lands in white space rather than on the last line. The top positions reserve the full line height, putting the baseline margin-plus-font-size from the top edge: 39pt at the defaults.

Width only matters on the right-hand positions, and rarely: in 11pt Helvetica "Page 1 of 10" is about 62 points wide and even "Page 247 of 312" only about 80, so nothing runs off a 595pt-wide page. Do keep the margin at 20pt or more for anything going to print, since at the minimum 8pt the number sits closer to the trim than most printers reproduce.

Does it change the file?

Almost not at all. The number is drawn in Helvetica, which every PDF reader is required to have, so nothing is embedded - each page gains a couple of hundred bytes. Nothing is re-rendered or re-compressed, so scans stay as sharp as they were, existing text stays selectable, and links, bookmarks and form fields keep working.

If something goes wrong

• The file will not load. A PDF that demands a password before it will display is genuinely encrypted - open it with the password, save an unprotected copy, and number that.
• The number lands on existing content. Raise the margin, or move it to a corner the page is not already using.
• The numbers look inconsistent. Mixed page sizes are each measured separately, so the number keeps the same distance from that page's own edge. Check the run before printing.

Related tools

Numbering is a last step. Before it, merge the sections into one file, reorder the pages and delete the ones you do not need - do that first, or the numbers will describe an order that no longer exists. Afterwards you might add a watermark or compress the file for email.

Number your PDF now

For most documents the defaults are already right: bottom centre, 11pt, a 28pt margin, and Skip the first page ticked if there is a cover. Open Add Page Numbers to PDF, drop your file in and download the numbered copy - free, no sign-up, and done entirely in your browser.