Add Page Numbers to PDF Online for Free

Adding page numbers places a formatted number at the bottom of each page in your PDF document. You choose from three positions (bottom-left, bottom-center, bottom-right), set the starting number, and select a font size between 8pt and 24pt. The numbers are rendered as text overlays using a clean, professional font that complements any document style without interfering with existing content.

The tool iterates through each page of your PDF using pdf-lib, calculates the position based on your settings and the page dimensions, and draws the number as a text element. Because this is a text overlay rather than an image, it adds only a few bytes per page to the total file size. A 500-page document with page numbers is barely larger than the original. The process takes about 1-2 seconds for documents under 100 pages.

Documents that look noticeably better with page numbers:

• Merged documents from multiple sources that lost their original numbering
• Legal filings and contracts where parties reference content by page number
• Reports and manuals that will be printed and discussed in meetings
• Academic papers and dissertations that require consistent page references
• Multi-section documents where each section was created separately

Adding page numbers through Adobe Acrobat requires a paid subscription ($20/month). Word processors can add numbers, but only if you convert to Word first, which risks formatting changes. Our browser-based tool works directly on the PDF, preserving every detail of the original layout while adding clean numbering in the position you choose.

Page numbering works best as the last step in your workflow. First merge your files, then fix any orientation issues, then remove unnecessary pages, and finally add numbers. This sequence produces consistent numbering that matches the final document structure. After numbering, update the metadata with a proper title for a polished result.