How to Add a Watermark to a PDF

By Daniel · Updated July 2026

A watermark is a quiet label that travels with the document. It says "this is a draft, don't treat it as final," or "confidential," or simply puts your name across your work so a copy can be traced back. It sits over the page without hiding what's underneath.

When a watermark earns its keep

  • Sending a proposal or contract that isn't signed off yet — DRAFT stops it being mistaken for the final version.
  • Sharing something sensitive — CONFIDENTIAL sets expectations before anyone reads a word.
  • Handing over work — your name or company across a document marks ownership.

How to add one

  1. Open the Watermark PDF tool and drop in your file.
  2. Type your watermark text, then set the opacity and angle. A faint diagonal stamp is readable without fighting the content underneath.
  3. Export the watermarked PDF.

Keep it subtle. A watermark cranked to full opacity makes the document hard to actually read, which defeats the point. Light grey, on a slight diagonal, is the look you're after.

Watermark PDF
Stamp text across a PDF, with control over opacity and angle. Free, nothing uploaded.
Open the tool →

Common questions

Can I control how strong the watermark looks?

Yes — adjust the opacity and angle so it's visible but doesn't overpower the text.

Does it go on every page?

Yes, the watermark is applied across the pages of the document.

Is this the same as protecting the PDF?

No — a watermark labels a document, it doesn't lock it. It's about marking, not access control.

Keep reading

Adding page numbers · Redacting a PDF · Signing a PDF