Add Watermark to PDF
Stamp custom text on every page — diagonal, horizontal, or footer position. Customise size + opacity.
1. Upload your file
How does the Add Watermark to PDF work?
Stamp a watermark like "DRAFT", "CONFIDENTIAL", or "PROPERTY OF" across every page of a PDF. Drop your PDF, type the watermark text, choose a position (diagonal across the centre is the classic look; horizontal centre reads more cleanly; footer is small and unobtrusive), set the font size and opacity, and click. Your watermarked PDF downloads. Watermarks are visible deterrents against casual misuse — they don't block reading. For confidential documents, pair the watermark with a password using Protect PDF for a stronger combination. Around 25% opacity gives a visible-but-non-distracting effect; bump to 40–60% if you want the watermark to dominate.
🔒 Security & Privacy
All processing happens on your device. Your files never leave your browser, never touch our servers, and are not stored anywhere. Close the tab and the file is gone.
📱 Use it on any device
Works in any modern browser — Mac, Windows, Linux, iPhone, Android, and tablets. No installation, no app to download. Just open the page and start.
⚡ Quick & easy
Drag, drop, click. Most files process in seconds, not minutes. No watermarks added to your output, no per-day limits, and the tool always shows the result before asking you to download.
🎁 Always free, no signup
Free to use, every time. No account creation, no email required, no “trial” that converts to a paid plan. We make money from ads so you don’t have to pay.