Add page numbers to PDF
Stamp page numbers on every page — pick the position (header or footer), font size, starting number and offset. All rendering is done locally in your browser.
or drop files here
Tip: select a single file.
How to use Add Page Numbers
- 1Click "Select PDF file" and choose the PDF you want to number.
- 2Pick a position (e.g. bottom-center), starting number, font size, and which pages to include.
- 3Click Add Page Numbers. The annotated PDF is generated in your browser and downloaded.
Why use PDF Lab
- Place page numbers in any corner or center position on the page.
- Files stay on your device — nothing is uploaded to any server.
- No account, no signup, no watermark on the output.
- Free to use with no per-file limits beyond your device's memory.
- Works on desktop and mobile browsers, including offline after first load.
- Control starting number, font size, and which pages receive numbers.
Your file never leaves your browser
Add Page Numbers runs entirely on your device using pdf-lib and pdf.js — both self-hosted by PDF Lab, so no third-party CDN sees your traffic. There is no upload, no account, no log of your file.
How browser-based PDF processing works →Add Page Numbers — questions
- No. Every operation runs in your browser using JavaScript. Your file is loaded into your browser's memory, processed, and a result is saved to your device. Nothing is sent over the network.
- No. Because the processing happens in your browser, neither PDF Lab nor any third party has access to the file contents. You can verify this by opening your browser's network tab while using the tools — no file data is transmitted.
- There is no enforced limit, but performance depends on your device's memory. Most modern browsers comfortably handle PDFs up to about 100 MB. Very large files may slow down your browser tab.
Are my files uploaded to your server?+
Can PDF Lab see the contents of my files?+
Are there file size limits?+
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