File & PDF Tools

Watermark PDF

Add a configurable text watermark to selected PDF pages.

Watermark PDF
Overlay a centered text watermark on selected pages.
Local browser processing

Watermark PDF

Render text with your browser font into a transparent PNG watermark and overlay it on selected pages, including non-Latin text.

Controls

  • Text, size, angle, and opacity
  • Page range
  • The watermark is written into a new PDF

Frequently Asked Questions

Can a watermark be removed?
Yes — for anyone who understands PDF structure, a light watermark is cheap to strip. A text watermark asserts ownership and raises the abuse bar; it is not encryption. Real protection for valuable documents combines access control, traceable watermarking, and legal remedies.
What opacity and angle work best?
Start from 10–20% opacity at -45° (bottom-left to top-right). Too dark reads hostile and obscures text; too light vanishes in print. Contracts suit ~15% gray diagonal; marketing copies can go bolder.
Will Chinese watermarks render as boxes?
No. Watermarks render through your browser’s local fonts into a transparent layer, so Chinese and English appear exactly as typed — far friendlier than server-side fixed-font approaches.