PDF Watermark & Page Numbers

Stamp a diagonal watermark and/or page numbers onto a PDF — entirely in your browser.

Add a text or image watermark to a PDF and insert page numbers — set opacity, angle and position. Free, in your browser, your file is never uploaded.

About PDF Watermark & Page Numbers

PDF Watermark & Page Numbers (pdf-stamp) is a free, browser-based tool that stamps a diagonal text watermark and/or page numbers onto an existing PDF. You drop in a PDF, type watermark text like "CONFIDENTIAL" and/or turn on page numbering, and download a new "-stamped.pdf" with the marks burned onto every page. It runs entirely in your browser using pdf-lib (drawing 45°-rotated bold Helvetica for the watermark and Helvetica for the numbers), so your file is never uploaded and there is no signup.

How to use PDF Watermark & Page Numbers

  1. Drop a PDF onto the upload area, or click to browse — the tool shows how many pages loaded.
  2. In the Watermark field, type the diagonal text you want (e.g. CONFIDENTIAL); leave it blank to skip the watermark.
  3. If you added a watermark, fine-tune it with the Opacity slider (3–60%) and the Size slider (20–120pt).
  4. Toggle on 'Add page numbers' if you want them, then pick a Format (Page 1 of N, 1 / N, Page 1, or just 1) and a Position (bottom center/right/left or top right).
  5. Set 'Start numbering at' if your first page shouldn't be 1 — the hint previews exactly what the first stamped page will read.
  6. Click 'Stamp & download PDF' to save the marked file as <name>-stamped.pdf.

Frequently asked questions

Is my PDF uploaded to a server?
No. The PDF is read and stamped entirely in your browser with pdf-lib, and the result is saved locally on your device — the file never leaves the tab and nothing is uploaded.
Is it free and do I need an account?
Yes, it's completely free with no signup, account, or added watermark of our own — only the watermark text you choose is stamped.
Can I add only page numbers, or only a watermark?
Yes. Leave the watermark field blank to add page numbers alone, or leave 'Add page numbers' off to apply just the diagonal watermark — you can also do both at once.
What page-number formats and positions are available?
Four formats — 'Page 1 of N', '1 / N', 'Page 1', or just '1' — and four positions: bottom center, bottom right, bottom left, or top right.
Can I start numbering from a number other than 1?
Yes. Use 'Start numbering at' to set the first page's number (for example, start at 5), and the on-screen hint previews exactly what the first stamped page will show.
How is the watermark drawn and can I control how it looks?
The watermark is bold text rotated 45° diagonally across every page. You control its opacity (3% to 60%) and its size (20pt to 120pt) with sliders.

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