Number the Pages of a Document You Built

Page numbers are the detail nobody notices until a stack of paper slides off a desk, a double-sided print comes back out of order, or somebody on a call says they are looking at the paragraph near the bottom of the third page and nobody else can find it.

There are two ways to get numbers onto a PDF here, and they are not the same job. The page numbers tool stamps them onto a finished file you already have. The document builder numbers a document while you are still writing it. This post is about the second one, including the thing about 1 of 2 that surprises people.

Numbering is off until you switch on Number the pages, or until you start from a template that numbers its own. After that there are three choices and no others:

• Position: nine anchors. Top, middle or bottom, each paired with left, centre or right.
• Format: a bare number, Page 1, or 1 of 4.
• Leave the first page unnumbered: one checkbox, off by default.

Everything else is fixed. The number is set in Helvetica at 10 points in the document's default ink, sits 36 points in from the paper edge, and the sequence always begins at 1. A different size, a colour, or a sequence continuing from a previous volume is the tool's job rather than the builder's, and it can be done to the exported file afterwards.

Position is the one choice with a practical consequence rather than an aesthetic one. Bottom centre survives being bound, stapled or hole-punched on either edge, which is why it is the usual default. Bottom right is easier to thumb through in a stack, and is the common choice for a form. Anything in the top row competes with a header for the same strip of paper, and the middle row is there for sideways pages rather than for ordinary text.

The convention is older than PDF. A title page or a covering letter carries no number because it is not part of the numbered body, and a number in the corner of an otherwise clean cover looks like a mistake. None of that is a rule, though, and it is the wrong default for a surprising number of documents.

The intake form that ships as a starting point here numbers from page one deliberately, and its reason is a good test for your own document. A form gets photocopied, faxed, scanned and stapled. The first sheet is precisely where a reader needs to be told that there is a second one.

This is the part that catches people out, and it is worth being exact about, because the sentence a reader builds in their head from 1 of 2 is more confident than anything else printed on the page.

The total counts numbered pages. It does not count sheets. On a three page document with the first page left unnumbered, the second sheet reads 1 of 2 and the third reads 2 of 2. Every statement on the paper is internally consistent, and the document is three sheets long.

The preview beside the builder is not an approximation of the output. It runs the same layout the export runs, measured with the same fonts, so the line breaks and the page count you are looking at are the ones you get. Page numbers are the single thing it does not show.

The reason is the order of operations. The layout builds the pages; the numbers are stamped across the finished pages afterwards, once there is a total to count. Nothing is guessed and nothing moves, but there is no number in the preview to look at, and the first place you will see one is the downloaded file.

If you want a number visible while you work, there is a second route. A reusable footer takes free text and resolves {page} and {pages} as each page is laid out, so a footer reading Page {page} of {pages} renders in the preview like any other line. It is the route the government application and consent form starting points take, and it lets you put a reference number beside the count.

• The document is going to be merged. Numbering each part first restarts the count partway through the finished file. Merge first, then number the result.
• The sequence continues from something else. A second volume starting at 47 needs a start number, which only the tool offers.
• Only some pages should carry a number. The builder numbers every page, or every page but the first. The tool takes a page selection.
• The paper is changing. Set the paper size before you number anything, because the position is measured from the edge of the sheet.

None of those are failures of the builder. Numbering is close to the last thing that should happen to a document, and a document still due to be cut, merged or reordered is not finished yet.