OpenToolkit

PDF Sign & Watermark

PDF

Add a signature image, diagonal watermark or page numbers to a PDF.

Open PDF Sign & Watermark

How to use

  1. Choose a PDF and select Signature, Watermark or Numbers.
  2. For a signature, choose a PNG/JPG and target page; for a watermark, enter text and opacity.
  3. Apply the change and download the new PDF.

Features

  • Signature-image placement
  • Text watermark across all pages
  • Centered footer page numbering
  • No document upload

Good to know

  • The signature tool places the image near the bottom-right of the selected page; it is not a cryptographic digital signature.
🔒 Private by design — PDF Sign & Watermark runs entirely in your browser. Your files and text never leave your device.