How to add a watermark to a PDF on Mac
Across every page, at the opacity you choose. A warning, not a lock.
A watermark runs across every page of a document, usually diagonally, usually faint. It tells a reader what they are holding before they read a word of it.
Watermarks and page numbering is part of Premium, so it carries a small lock in the document actions panel and in the menu bar. The lock is a label rather than a barrier — you can open the feature and see what it does before deciding to unlock it. Reading and every page operation stay free.
Add one, step by step
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Open Watermark & Numbering
From the document actions panel, under Content.
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Set the text
DRAFT, CONFIDENTIAL, NOT FOR CIRCULATION, a client name, a date. Short is better — a long watermark is unreadable at any angle.
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Set the appearance
Size, angle, colour and opacity. Diagonal at around 45° is conventional because it does not line up with the text underneath.
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Get the opacity right
This is the only setting that really matters. Too faint and nobody notices; too strong and the document cannot be read. Around 10–20% of a mid grey is usually about right — and check it on a dense page, not a title page.
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Apply and save
It goes across every page. Save under a new name so the clean original survives.
What a watermark is for
| Watermark | Says |
|---|---|
| DRAFT | Do not rely on this; it will change. |
| CONFIDENTIAL | Do not circulate this outside its intended audience. |
| A client or matter name | This copy belongs to a particular engagement. |
| A date | This is the version as at a particular day. |
| SPECIMEN or SAMPLE | This is not a live document and cannot be used as one. |
It does not stop anyone doing anything. A determined reader can remove it, crop around it, or retype the document. Its value is that an honest reader can see at a glance what they are looking at — which prevents the far more common problem of a draft being treated as final. If you need actual restriction, use password protection. If something must not be readable at all, use redaction.
Making a watermark permanent
An applied watermark can be removed by whoever receives the document unless the document is flattened. For a draft circulating internally that hardly matters. For something being sent outside where the label is the point, flatten it.
Watermarking a folder
Stamping a whole set of documents as DRAFT before a review round, or with a client name before sending a bundle, is a batch recipe: configure it once and run it across the folder.
Frequently asked questions
How do I add a watermark to a PDF on a Mac?
Open Watermark & Numbering from the document actions panel, set the text and the appearance, and apply. It goes across every page.
What opacity should a watermark be?
Faint enough to read through and strong enough to notice — around 10–20% of a mid grey is usually right. Check it on a dense page rather than a title page.
Does a watermark protect my document?
No. It is a label, not a lock: it can be removed, cropped around or retyped. Its value is telling an honest reader what they are holding. For actual restriction use password protection.
Can I watermark only some pages?
A watermark is designed to run across the whole document. For a single page, a stamp is the right tool.
Can the recipient remove my watermark?
Unless you flatten the document, yes. Flattening makes it part of the page.