When to Use a PDF Watermark
A watermark is text or an image stamped across every page of a document — visible to anyone who opens the file. It serves a few practical purposes:
Status marking: "DRAFT" on documents still being reviewed. "SAMPLE" on quotes or proposals sent before payment. "APPROVED" after sign-off. These prevent confusion about which version is which.
Confidentiality: "CONFIDENTIAL" or "INTERNAL USE ONLY" signals that a document shouldn't be forwarded or shared publicly. It won't stop a determined leak, but it establishes that the document was clearly marked — important for legal and compliance purposes.
Branding: Your company name or website across every page of outgoing documents. Professional and hard to strip without obvious signs.
Distribution control: Adding the recipient's name as a watermark makes it traceable if a document leaks — "Prepared for John Smith" on every page tells you exactly who shared it.
How to Add a Watermark to PDF
Open our [Add Watermark](/add-watermark) tool
Upload your PDF
Type your watermark text (e.g. "CONFIDENTIAL", "DRAFT", your company name)
Set opacity — 20–30% for subtle background, 60–80% for prominent marking
Choose rotation — 45° diagonal is standard for security watermarks
Select position — centre of page for full coverage, or corner for minimal interference
Click Add Watermark and download
The whole process takes about 30 seconds.
Choosing the Right Settings
Opacity:
- 15–25% — visible but doesn't obscure text. Best for branded documents you'll print or share with clients.
- 30–50% — clearly visible, still readable underneath. Standard for DRAFT and CONFIDENTIAL marks.
- 70–100% — very prominent. Use only when the watermark is the point (like VOID or CANCELLED).
Rotation:
- 0° (horizontal) — clean, professional. Good for headers or footers.
- 45° (diagonal) — the industry standard for security marking. Harder to crop out because it covers corners.
- Custom angle — some organisations use -30° or 60° for a specific branded look.
Font size:
- Small (24–36pt) — for repeated tile patterns across the page
- Large (72–120pt) — for single centred watermarks like DRAFT or CONFIDENTIAL
Watermark vs. Password Protection — What's the Difference?
These serve different purposes and are often combined:
| Method | What It Does | Can Be Bypassed? |
|---|---|---|
| Watermark | Visually marks the document | Can be covered or cropped by determined users |
| [Password protect](/protect-pdf) | Blocks access to the file entirely | No, without the password |
| [Redaction](/redact-pdf) | Permanently removes content | No — content is gone |
For sensitive documents, use a watermark AND password protection together. The password stops unauthorised access; the watermark proves the document was classified even if the password is later shared.
Making Watermarks Permanent
By default, a watermark is a layer on top of the PDF content. A PDF editor could theoretically remove it. To make it permanent and tamper-proof:
Add your watermark using our Add Watermark tool
Then run the watermarked PDF through our [Flatten PDF](/flatten-pdf) tool
Flattening merges all layers into a single static image — the watermark becomes inseparable from the content
This is the right approach for legal submissions, contracts, and compliance documents.
Frequently Asked Questions
Can I add a logo image as a watermark instead of text?
Our watermark tool currently handles text watermarks. For an image watermark (like a company logo), use our [Edit PDF](/edit-pdf) tool to place a transparent PNG logo on each page.
Will the watermark show when the PDF is printed?
Yes. Watermarks print exactly as they appear on screen, at the opacity and position you set.
Can the recipient remove my watermark?
A standard watermark layer can be removed by someone with PDF editing software. If removal prevention is critical, flatten the PDF after watermarking — this makes the watermark inseparable from the page content.
Does adding a watermark increase file size much?
Slightly — usually less than 5% increase for a text watermark. Negligible for most purposes.