Add Page Numbers to PDF Online — Free Page Numbering Tool

Adding page numbers to a PDF might sound simple, but the details matter enormously — does the number go on every page or only some? Should it say "1" or "Page 1 of 24"? What font, size, and color match the document's design? UseToolify's Add Page Numbers to PDF tool answers all of these questions without requiring you to install Adobe Acrobat or upload sensitive documents to an unknown server.

The tool is powered by pdf-lib, a zero-dependency JavaScript library for reading and writing PDFs in the browser. When you click Download, pdf-lib opens your file, embeds a standard PDF font (Helvetica, Times Roman, or Courier), and draws a text layer on each selected page at the precise coordinates you chose. The result is a native PDF text element — not an image — which means the quality is perfect regardless of zoom level or print output.

Six position options cover every common page numbering convention. Legal documents typically number pages at the bottom center; academic papers often use top right; books may use alternating top outside corners (handled by running the tool twice with different start and end page settings). The Custom format field gives you full control with {n} and {t} placeholders — so you can create formats like "– 3 –" or "Draft / Page 3 of 20".

Because everything runs locally in your browser, there are no file size limits imposed by a server, no waiting for uploads, and no concern about who has access to your document. Your file is read into memory, processed in microseconds, and the resulting PDF is handed directly back to you as a browser download. Nothing is ever transmitted over the network. If you need to change the page orientation before numbering, use our Rotate PDF tool first for perfect alignment.

You may also find our Merge PDF, Rearrange PDF Pages, and Add Watermark to PDF helpful.