Add Page Numbers to a PDF Free

Number pages: what actually changes in the file

A page number is not a special object in a PDF. It is simply text placed near an edge, and a reader shows it along with everything else on the page. This tool stamps that text onto each page at the position you chose, using a real PDF font, which is why the number is selectable and searchable rather than a picture. The rest of the page is copied untouched, so nothing else shifts or re-encodes.

The one genuinely tricky part is rotation. A PDF page can carry a /Rotate flag that tells readers to turn it sideways, which is common in scans. If you ignore that flag, the number lands in the wrong corner and reads sideways. This tool reads each page's rotation and compensates, so a page that displays in landscape still gets an upright number in the corner that looks like the bottom right to the reader.

Two honest notes. If a page already has a number, the new one is drawn on top of it rather than replacing it, so pick a corner that is clear. And the number counts pages in file order: it does not read any existing numbering scheme, Roman numerals or section breaks.

Use cases: five times an unnumbered packet causes problems

• A tender or court filing that requires folio numbers. The submission rules say every page must be numbered in the bottom outer corner. Stamp them all in one click instead of numbering 80 pages by hand.
• A thesis draft with front matter. Number the whole document from 1, then use Start at 0 so the cover page reads as page 0 while the body still counts from 1.
• A scanned contract with no text layer. The pages are images, so there is nothing to number in a reader. Stamping real text on top gives a selectable number the reviewer can cite.
• Merged packets from several sources. After combining files, the page order is fixed but nothing is numbered. Add numbers last so the final order is what gets counted.
• A rotated landscape exhibit inside a portrait report. Because the tool compensates for each page's rotation, the one sideways chart still gets an upright number in the same corner as its neighbors.

Need the whole document stamped with a watermark too, or the order changed? Those live on the Tools page, including the PDF Watermark.

Limits: what this tool won't do, and why

An honest list beats a surprised user:

• One style for the whole document. Every page gets the same format, size and edge. Numbering the front matter in Roman numerals and the body in Arabic needs section breaks, which is a word processor's job, not a stamper's.
• It does not skip the cover automatically. If you want the cover unnumbered, either accept the number on it or use Start at 0 so the cover reads as page 0 and the body starts at 1. The tool cannot know which page is a cover.
• It draws over existing numbers. If a page already has a number, the new one is stamped on top rather than replacing it, which looks messy. Pick a corner that is clear, or remove the old numbers with an editor first.
• It does not update a table of contents or bookmarks. The numbers are visual text. A linked table of contents still points at the same pages it always did, because the page count and order never changed.
• Password-protected PDFs are refused. Without the password no library can open the document, so the tool says that plainly instead of returning a broken file. Print the unlocked version to PDF in a reader, then number it here.
• It does not compress the file. Stamping text barely changes the size. Squeezing the result is the PDF Compressor's job.

Need the numbered file smaller, or the pages as images? Those live on the Tools page.