Page Numbers
Add page numbers to PDF
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Page numbers are a fundamental element of any professional document. A long report without page numbers is almost unusable in a meeting setting — you cannot tell colleagues to 'turn to page 47' if no pages are numbered. Legal filings, academic theses, technical manuals, corporate presentations, and published books all require page numbers as a baseline expectation of professional formatting. Despite this, many PDFs arrive without them, particularly those assembled from multiple sources, exported from design software, or scanned from physical originals. LazyPDF's Page Numbers tool adds sequential page numbers to any PDF document in seconds, running entirely inside your browser with no file uploads required. You can configure every aspect of the numbering: choose the starting number for documents that are part of a larger series, select from multiple format options including plain numbers, 'Page X', or 'Page X of Y' for documents where showing the total count is helpful, and place numbers at the bottom center, bottom corners, top center, or top corners to match your document's existing layout and margins. The numbers are drawn directly onto each page's content layer using pdf-lib, which means they appear correctly in print as well as on screen. For confidential documents, the entirely browser-based processing ensures your file never leaves your device. The output PDF is ready to share, file, or print immediately with clean, professional page numbering applied throughout.
How It Works
Page Numbers draws sequential page numbers directly onto each page of your PDF document. You can choose the starting number, position, and format. The tool uses pdf-lib to modify each page's content stream in your browser — your file is never uploaded to any server.
Key Features
Custom Start Number
Begin numbering from any number, not just 1. Useful for documents that are part of a larger publication or series.
Position Options
Place page numbers at the bottom center, bottom corners, top center, or top corners to match your document's layout.
Multiple Formats
Choose from different numbering formats including plain numbers, 'Page X,' or 'Page X of Y' to suit your needs.
Browser Processing
All page numbering happens locally in your browser. Your document never leaves your device.
Frequently Asked Questions
Can I start page numbers from a number other than 1?
Yes. You can set any starting number in the options. This is helpful when your PDF is part of a larger document and you need the numbering to continue from where a previous section left off.
Will page numbers overlap with existing content?
Page numbers are placed in the margins of each page. For most standard documents, the default positions work well. If your document has content extending into the margins, you may want to try different position options to find one that avoids overlap.
Can I add page numbers to specific pages only?
Currently the tool adds numbers to all pages in the document. If you need to skip certain pages, you can use the Split tool to separate those pages, add numbers to the remaining pages, and then use Merge to reassemble the document.
What font size are the page numbers?
The tool uses a standard readable font size appropriate for most document layouts. The numbers are rendered in a clean sans-serif style that is clearly legible without competing with the main document content.
Can I add page numbers to a scanned PDF?
Yes. Since the page number text is drawn as a new layer over each page's content, it works regardless of whether the page is a scanned image, a text-based PDF, or a mixed document. The numbers appear cleanly over the existing content.
Will removing the page numbers later be possible?
Page numbers added by this tool are drawn directly into the page content layer. They cannot be selectively removed after the fact without specialized PDF editing software. If you are experimenting with placement, try a few versions before keeping one, since there is no simple undo for embedded content additions.
Does adding page numbers change the file size significantly?
No. Adding page number text adds only a minimal amount of data to each page — typically just a few bytes per page. Even a 200-page document will only see a negligible file size increase from adding page numbers.