Quick answer: open Toolzio's free Add Page Numbers tool, drop in one PDF, pick a position (top or bottom), an alignment (left, center, or right), a format (1, Page 1, or 1 / N), and a starting number — then click Add Page Numbers and download the result. Everything runs in your browser: no uploads, no account, no software to install. The one catch to know before you start: every page gets a number, including the cover — there is no skip-first-page option, and the workaround for that is below.

How to add page numbers to a PDF step by step

  1. Open the Add Page Numbers tool in your browser and drop in one PDF file.
  2. Check the live preview: it shows how the first page's number will look with your current settings.
  3. Set Position to Bottom (the usual choice) or Top, and Alignment to Left, Center, or Right.
  4. Pick a Format: plain 1, Page 1, or 1 / N for the total-page style.
  5. Set the Starting number — leave it at 1 for a standalone document, or enter the number this file continues from (see below).
  6. Adjust Font size (8–20; the default 11 suits most documents) and Color (the default is a quiet slate gray) if you want the numbers to stand out more or less.
  7. Click Add Page Numbers and download the result, named like report-numbered.pdf. Open it and check the first and last pages before sending.

Position, alignment, and format: what each setting does

The settings are few on purpose — page numbers should be boring and predictable:

  • Position (top or bottom): bottom center is the convention for reports, theses, and contracts. Top is the better choice when the footer already holds footnotes, disclaimers, or a signature block that a number would collide with.
  • Alignment (left, center, or right): center is the safe default. Right suits business documents that already right-align their footers; left works for documents that will be bound on the left, where a centered number can drift toward the spine.
  • Format: plain 1 is cleanest for long documents. Page 1 reads better in short handouts that get quoted page by page. 1 / N tells the reader how long the document is — useful for exhibits and packets where nobody should wonder whether a page is missing.
  • Starting number: this is what makes a split document read as one. If your file is the second half of a packet, start it at the next number after the first half ends instead of restarting at 1.
  • Size and color: size runs 8–20 and color is any color you pick. The defaults (11, slate gray) are deliberately quiet — a page number should help navigation, not compete with the text.

Choosing settings for common documents

  • Report or thesis: bottom center, plain numbers, starting at 1. If your institution numbers front matter separately, number the main body as its own file starting from the right number instead of fudging one file.
  • Exhibit or evidence packet: bottom right, Page 1 format, so a quoted page reference is unambiguous in a hearing or a filing.
  • A file that continues another document: set the starting number to one more than the last page of the earlier file. If the first file ends on page 24, start this one at 25 — the whole packet then reads continuously.
  • Handout or slides exported as PDF: bottom center, 1 / N, so the audience can see how far through the handout they are.

The cover-page problem — and the workaround

Many documents should not number the cover: the title page looks cleaner without a stray "1" at the bottom. Toolzio has no skip-first-page toggle, so the honest workaround uses two other free tools and takes about a minute:

  1. Split the cover off with the split tool — one file for page 1, one file for the rest.
  2. Number the rest-of-document file with a starting number of 2.
  3. Merge the cover back in front with the merge tool. The result reads exactly as it should: an unnumbered cover, then pages numbered 2, 3, 4, and so on.

Check before you send

  • Already-numbered pages: if the PDF already carries printed numbers, stamping new ones gives you duplicates. Open the file and look before you number.
  • Footer collisions: numbers sit near the page edge, but a full footer — footnotes, a disclaimer line, a signature block — can still clash. If the bottom is busy, move the numbers to the top instead of shrinking them until they are unreadable.
  • The 1 / N quirk: when the starting number is not 1, the "N" shown is the last page's number, not the page count. A 10-page file starting at 5 ends on "14 / 14" — correct as a page label, but surprising if you expected "14 / 10". With a starting number of 1, the two agree.
  • First and last page: always open the downloaded file and check both. The preview shows the first page only, so the last page is where a total-format surprise or a collision shows up.

Honest limitations

  • Every page is numbered. There is no way to number a range of pages only — the split-and-merge workaround above is the way to leave pages out.
  • One PDF at a time. Batch-numbering a folder of files is not supported.
  • Decimal numbers, one font. No roman numerals, no custom typefaces, no prefix text like "Exhibit A-" — if you need those, a desktop editor is the right tool.
  • Numbers are drawn onto the page. They become part of the PDF's content, not a removable layer — keep your original file if you may want an unnumbered copy later.

Once the pages are numbered, the document is usually headed somewhere else — combined with other files, in which case our guide on how to merge PDF files keeps the order right, or split apart again, which the split guide covers.