How to add a watermark to a PDF
By Nasir Uddin Shamim · Founder, PrintxPDF
Updated 2026-08-14 · 6 min read
Short answer: To add a watermark to a PDF, open the file in a watermark tool, type the text you want such as DRAFT or CONFIDENTIAL, set opacity to around 15 percent and rotation to 45 degrees, choose centred or tiled placement, then apply it to every page and save the result.
A watermark is a piece of text or an image drawn across every page of a document, behind or in front of the content, usually pale and usually diagonal. Its job is to change how a reader treats the page: this is a draft, do not quote it; this is confidential, do not forward it; this is a sample, do not use it in production.
Adding one takes about thirty seconds. Getting one that reads clearly without making the text underneath unreadable takes knowing four numbers: opacity, rotation, size and placement.
Add a watermark in your browser
- Open the tool Go to Add watermark and drop your PDF onto the page. The file is processed in the browser tab, so nothing is uploaded.
- Type the watermark text Keep it to one or two words. DRAFT, CONFIDENTIAL, SAMPLE, COPY and NOT FOR DISTRIBUTION are the standard ones. Longer strings have to be set smaller, which defeats the purpose.
- Set opacity to 10-20 percent Below 10 percent the mark disappears on a laser printer. Above 30 percent it competes with the body text. Fifteen percent is the safe default for grey; use 12 percent for red, which reads darker.
- Set rotation to 45 degrees A diagonal mark crosses the text at an angle, so no single line of body text is obscured for its whole length. Zero degrees looks tidier on screen but hides more words.
- Choose centred or tiled One large centred mark for a warning. A tiled grid of small marks when you want the mark to survive someone cropping or screenshotting part of the page.
- Apply to the right pages All pages is the default. If you are marking a covering page only, enter a page range such as
1before you apply. - Save the file Download the marked copy. Keep the original unmarked file, removing a watermark cleanly afterwards is harder than making a fresh copy.
Add a text watermark to every page of a PDF, free and in your browser.
The settings that matter
| Setting | Recommended | Why |
|---|---|---|
| Opacity | 10-20% (15% default) | Visible on paper, still lets 11pt body text read cleanly through it. |
| Rotation | 45° (or -45°) | Crosses lines of text at an angle instead of running along one line and burying it. |
| Font size | 60-90pt centred, 18-28pt tiled | A centred mark should span roughly two-thirds of the page width. |
| Colour | Mid grey #808080, or red #C00000 for CONFIDENTIAL | Grey stays neutral in greyscale printing. Red signals urgency but prints as dark grey. |
| Opacity | Around 0.25 | The mark is drawn over the page, so low opacity is what keeps body text readable. Raise it only when the mark must be impossible to miss. |
| Placement | Centred for warnings, tiled for reuse control | Tiling survives cropping; a single centred mark does not. |
Watermark settings and the values that work in practice.
Tiled or centred?
A centred watermark is a message to a cooperative reader. A tiled watermark is a deterrent against reuse: if someone crops a figure out of your report, the crop still carries part of a mark. Tiling costs readability, so use 8-12 percent opacity when you tile, and keep the tile text short, a name or a domain rather than a sentence.
Text watermark or image watermark?
- Text stays crisp at any zoom, adds a couple of kilobytes, and can be searched for later. Best for status words.
- Image is right for a logo or a signature block. Export a PNG with a transparent background at roughly 1000px wide, then let the tool scale it down; a small image scaled up looks blurred on paper.
- Both is common on client deliverables: a pale logo tiled behind the content, plus one large DRAFT across the middle.
Note: A text watermark is added to the page content, which means text extraction tools will report the watermark word alongside your real text. If you are running OCR or feeding the file to a search index later, expect DRAFT to appear on every page of the extracted text.
A watermark is not security
Watch out: A watermark is a label, not a lock. It does not stop anyone reading, copying, printing or forwarding the file. Anyone with a PDF editor can select the watermark object and delete it in a few clicks, because it is just another drawing instruction on the page.
This matters because people substitute a watermark for a control it cannot provide. If the requirement is genuinely "this person must not read this", a watermark is the wrong tool. Work through what you actually need:
| What you need | What actually does it |
|---|---|
| Warn a reader that a document is provisional | A watermark, this is exactly its job |
| Discourage casual reuse of your images or copy | A tiled watermark, plus a visible copyright line |
| Stop someone opening the file at all | Encryption with an open password, see password protecting a PDF |
| Remove sensitive words from the file entirely | Real redaction, see redacting a PDF properly |
| Prove a document is genuine and unaltered | A digital signature |
You can make a watermark harder to remove by flattening the file afterwards, which merges layers and form fields into the page content. That defeats a casual "click and delete" attempt. It does not defeat anyone determined, and it also makes your own text non-editable, so only flatten the copy you are sending out.
Tip: For per-recipient tracking, put the recipient name in the tiled watermark itself, a faint repeated "Issued to A. Khan, 14 March 2026" across the page. If a copy leaks, the mark tells you which copy it was. This is the one case where a watermark genuinely changes behaviour.
What to write on the mark
- DRAFT, content may still change. Pair it with a version number in the footer.
- CONFIDENTIAL, internal or contractual restriction on sharing.
- FOR REVIEW ONLY, clearer than DRAFT when you want comments back by a date.
- SAMPLE or SPECIMEN, for template documents that must never be mistaken for a real certificate or invoice.
- SUPERSEDED, for archived versions, so an old copy in someone's downloads folder does not get used.
Once the mark is on, most documents also want page numbers so a reader can refer to "the table on page 7" without counting sheets.
Frequently asked questions
How do I add a DRAFT watermark to a PDF for free?
Open the file in a browser-based watermark tool, type DRAFT, set opacity to about 15 percent and rotation to 45 degrees, and apply it to all pages. No account or installation is needed, and the file never leaves your computer.
Can I remove a watermark from a PDF?
Often yes. A watermark added as a separate object can be selected and deleted in a PDF editor. If the page has been flattened or converted to an image, removing the mark cleanly is much harder and usually damages the text underneath.
Does a watermark stop people copying my PDF?
No. A watermark is a visual label with no enforcement behind it. It does not block copying, printing, forwarding or text selection. Use encryption for access control and real redaction for removing sensitive content.
What opacity should a PDF watermark be?
Between 10 and 20 percent for grey text, with 15 percent as a good default. Red or dark colours read heavier, so drop them to around 12 percent. Anything above 30 percent makes body text noticeably harder to read on paper.
Can I watermark only some pages of a PDF?
Yes. Most tools accept a page range, so you can mark pages 2 to 10 and leave a cover page clean, or mark an appendix only. Enter the range before applying, since the operation is applied in one pass.