How to Add a Watermark to a PDF (Free)

To stamp a word like DRAFT or CONFIDENTIAL diagonally across every page of a PDF, you don't need Acrobat or an account — the free PDF Watermark tool does it in your browser, and the file never leaves your device. Here's how, and what a text watermark can and can't do for you.

Add a text watermark in a few steps

1. Open the PDF Watermark tool.
2. Load your PDF — every page appears so you can preview the result.
3. Type your watermark text (for example, DRAFT or © 2026 Acme Ltd).
4. Adjust position, angle, size, and opacity.
5. Apply and download the watermarked copy.

Because it runs locally, sensitive documents — contracts, proposals, unreleased reports — stay on your machine.

Positioning and opacity

The settings that matter most:

• Position & angle. A watermark centered and rotated ~45° across the page is the classic "stamped" look and is hard to crop out. Corner placement is subtler, for a quiet copyright line.
• Opacity. Keep it low — around 10–25%. Too dark and it fights the text underneath; too light and it's invisible. The preview is your guide.
• Size. A large centered word (DRAFT) reads at a glance; a small repeated line suits a copyright notice.

Common use cases

• DRAFT / NOT FINAL — signals that a document isn't approved, so nobody circulates it as final.
• CONFIDENTIAL / INTERNAL — labels sensitive material and discourages casual forwarding.
• Copyright or ownership — © Your Name across images or portfolios you share for review.
• Company name — light branding on proposals and quotes.

A tidy finishing workflow

Watermarking is usually the last step before a PDF goes out. Add page numbers first with PDF Add Page Numbers, combine any pieces with PDF Merge, then watermark. If the finished file is too large to email, run it through Compress PDF — but watermark before compressing, not after.

Limitations

Be clear about what a text watermark is: a visual overlay, not security. It doesn't restrict, encrypt, or lock the document.

• It's not DRM. Anyone can still open, copy, print, and re-share the file. A watermark deters casual misuse; it doesn't prevent it.
• It can be removed. A determined user with the right software can strip or paint over a text overlay. Treat it as a deterrent and a label, not a guarantee.
• It won't stop copying text. The words underneath are still selectable; the watermark sits on top, it doesn't redact anything.
• For real protection, you need password encryption or a rights-management system — a different category of tool. Use PDF Watermark for signaling intent (DRAFT, CONFIDENTIAL, ownership), and don't rely on it to keep secrets.