Document status
Mark review copies DRAFT, SAMPLE, PRELIMINARY, or NOT FOR DISTRIBUTION so readers do not mistake them for a final version.
Watermark PDF online
Add DRAFT, CONFIDENTIAL, or your own text across every page of a PDF. Set the opacity, the text size, and whether the label runs diagonally or horizontally.
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Practical guide
Watermark a PDF so the label reads clearly on every page
A watermark communicates status or ownership without replacing the original content. Use it to mark a working copy as DRAFT, label internal material CONFIDENTIAL, or add a short organization name. This tool draws the same line of text through the center of every page in mid-grey Helvetica Bold, and gives you three settings besides the wording itself: opacity, text size, and whether the line sits at 45 degrees or flat across the page.
- 5–60%
- Range of the opacity slider. It opens at 15%, which suits most text-heavy pages.Measured from this tool's opacity control
- 20–120 pt
- Range of the text size slider. A PDF point is 1/72 inch, so 72 pt is one inch on the page.Tool size slider; point unit from ISO 32000-1
- 447 pt
- Width of the word CONFIDENTIAL in Helvetica Bold at the default 60 pt, against the 595 pt width of an A4 page.Measured with pdf-lib, the library this page uses
How to watermark a PDF in 3 steps
- 1
Choose the document
Load the PDF you want to label. The file stays on your device and the original is never modified, so it is safe to try more than one watermark setting.
- 2
Set the watermark
Type a short label, drag the opacity slider between 5 and 60%, set the size between 20 and 120 pt, and leave Diagonal ticked for a 45-degree label or clear it to keep the text horizontal.
- 3
Download and inspect
The copy downloads with -watermarked added to the filename. Open it and check a light page, a dark page, and a page of dense text to confirm the label is visible without hiding anything important.
Worked examples
| If you need to | Do this | You get |
|---|---|---|
| Mark a review copy as unfinished | Type DRAFT, keep Diagonal ticked, opacity 15%, size 60 pt | Grey DRAFT at 45 degrees through the middle of every page; report.pdf downloads as report-watermarked.pdf |
| Label an internal report before circulation | Leave the default CONFIDENTIAL text, opacity 20%, size 48 pt | A 357 pt wide label centered on each page, well inside the width of A4 and Letter pages |
| Keep dense body text fully legible | Drag opacity down to 5% and the size down to 30 pt | The faintest setting the opacity slider allows; the label is drawn on top of the page content, but at 5% it only tints the text underneath |
| Use a longer phrase such as NOT FOR DISTRIBUTION | Clear Diagonal and set the size to about 40 pt | A line 474 pt wide that fits inside the 595 pt width of an A4 page; the same phrase at 60 pt is 710 pt and runs off both edges |
| Watermark a file that mixes portrait and landscape pages | Apply once with the settings you have chosen | Each page is measured on its own, so the label lands in the center of every page whatever its width and height |
When to watermark a PDF
Confidential material
Place an INTERNAL or CONFIDENTIAL reminder on every page of a report before controlled circulation.
Proof and preview copies
Label a low-risk evaluation copy before sending artwork, reports, or learning materials for approval.
Simple attribution
Add a short company, department, or project name when a lightweight ownership marker is enough for the intended workflow.
Tips to watermark a PDF well
- Keep the wording short. Long phrases need a smaller size to stay inside the page, because the text is not shrunk to fit for you.
- The opacity slider starts at 15%, which reads well on ordinary text pages. Raise it toward the 60% maximum when a dark or scanned background swallows the label.
- Ticking Diagonal turns the text 45 degrees, which crosses more of the page and leaves room for a longer label. Clearing it keeps the line horizontal, which looks calmer on formal documents.
- The label is always drawn in mid-grey Helvetica Bold, so contrast comes from the opacity and size sliders rather than a color or font choice.
- Keep the clean master as a separate file. Once the watermark is part of the page content, removing it later without disturbing the page is not reliable.
Good to know
- A visual watermark is a notice, not access control. It does not encrypt the PDF or stop recipients from copying and sharing it.
- This tool adds one line of text in the center of every page; it does not add image logos, per-page text, or recipient-specific identifiers.
- The label is drawn on top of the page content rather than behind it, and it follows any rotation already stored in the page, so a page saved at 90 degrees shows the label turned with it. Straighten those pages first if the angle matters.
- The standard Helvetica Bold font covers Latin characters and accents. Chinese, Japanese, Cyrillic, Greek, and Arabic text cannot be encoded and the watermark will fail to apply.
- Watermarking modifies the file and may invalidate an existing certificate signature. Add the certificate signature after the watermark.
Questions about how to watermark a PDF
▸What opacity should a PDF watermark use?
The slider here runs from 5% to 60% and opens at 15%. Around 15% works for most text documents. Raise it for image-heavy or dark pages, then check that body text, figures, and signatures are still easy to read.
▸How do I put CONFIDENTIAL on every page of a PDF?
Load the file, leave CONFIDENTIAL in the watermark text box, pick an opacity and size, and download the copy. The word is drawn once through the center of every page, so no page selection is needed.
▸Will the watermark appear on every page?
Yes. The same text, size, opacity, and angle are applied to the center of each page, and every page is measured separately, so a document with mixed page sizes still gets a centered label.
▸Can I use an image or a logo as the watermark?
Not with a text watermark, which draws characters only. For a logo, signature, or PAID graphic, use a stamp tool instead: it takes an image file and lets you place it where you want on the pages you choose.
▸Is a watermark a security feature?
No. It can communicate status, confidentiality, or ownership, but it does not prevent opening, copying, editing, or forwarding the file. Use encryption and access controls when your workflow requires those protections.
▸Can I remove the watermark later?
The watermark may damage page content if you try to remove it. Keep the original unwatermarked file as your master and treat the downloaded copy as a separate version.
▸What is the watermarked file called?
The download keeps the original name with -watermarked added, so report.pdf becomes report-watermarked.pdf. The file you loaded is left exactly as it was, which makes it easy to try different settings and compare the results.