How to Add a Watermark to PDF: Text, Logo & Draft Stamps [2026]

Answer first: to watermark a PDF, open the free watermark tool, upload the file, type your stamp text (CONFIDENTIAL, DRAFT) or upload a logo, set low opacity so content stays readable, and download. The whole job takes about a minute and runs entirely in your browser.

Which watermark do you need?

Goal	Watermark	Settings that work
Mark a draft	Diagonal "DRAFT" text	Center, ~45°, 10–15% opacity, tiled or single
Protect a proposal	"CONFIDENTIAL" + recipient name	Diagonal, 12–18% opacity, every page
Brand a deliverable	Logo, corner or footer	Corner, 40–60% opacity, small size
Prove ownership	Copyright line + date	Footer, small, 50% opacity

How to watermark a PDF (1 minute)

Open the PDF watermark tool.
Upload your PDF.
Choose text (type CONFIDENTIAL, DRAFT, your company) or upload a logo PNG.
Set position (diagonal center for status, corner for branding), opacity, and which pages to stamp.
Download and spot-check three pages: first, middle, and last.

Settings that keep documents readable

Opacity: 10–20% for full-page diagonal stamps; up to 60% only for small corner marks.
Size: large enough to read at a glance, small enough that body text dominates.
Every page: stamp all pages — a confidential doc with three unstamped pages is not marked at all.
Contrast: gray stamps on white pages; avoid colors that clash with charts and signatures.

Watermarking in a bigger workflow

Typical order: finalize content in the editor → stamp the watermark → sign → optionally password-protect → compress for sending. Watermarking before signing seals the stamp into the signed version; compressing last keeps the emailed file under attachment limits.

Common watermark mistakes

Too dark: a 50%-opacity full-page stamp makes contracts genuinely hard to read — and annoying to sign.
First page only: recipients screenshot page 2. Stamp the whole document.
Watermark as security: stamps deter casual misuse but anyone can re-export the pages — pair with passwords for real protection.
Covering signatures: keep stamps clear of signature blocks and seals.

Conclusion

One subtle stamp prevents most "is this final?" and "whose file is this?" confusion. Add yours with the free PDF watermark tool — no signup, private, instant.

Frequently Asked Questions

How do I add a watermark to a PDF for free?

Open the free watermark tool, upload your PDF, type your text or upload a logo, set opacity and position, and download. It runs in your browser with no signup.

What opacity should a PDF watermark be?

For background diagonal stamps like DRAFT, 10–20% opacity keeps text readable. For footer branding, 40–60% works. Anything above ~25% across the full page starts hurting readability.

Can I use my logo as a PDF watermark?

Yes — upload a PNG with transparency. Keep it subtle (low opacity, corner or diagonal placement) so it brands without blocking content.

Does watermarking change the PDF content?

No. Watermarks are an overlay layer — original text and images stay intact underneath.

Is a watermark the same as redaction?

No. Watermarks add visible stamps; redaction permanently removes content. A watermark never hides sensitive text — use the redact tool for that.

Should I watermark before or after signing?

Watermark first, then sign. Signing usually flattens the document, sealing the watermark into the final version.