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EDIT
Stamp words like DRAFT or CONFIDENTIAL, or your logo, across every page of a PDF.
QUICK ANSWER
To add a watermark to a PDF, add the file, type the watermark text or choose an image, then pick the placement, opacity and angle. The preview shows the result on the page before you download. It runs in your browser, so your file isn’t uploaded.
Updated 31 October 2026 · Written by the StackPDF teamUpdated 31 October 2026 · StackPDF team
You’ll set the text or logo next. It stays in this browser.You’ll set the text or logo next. It stays in this browser.
PDF files · Runs in your browser
QUICK ANSWER
To add a watermark to a PDF, add the file, type the watermark text or choose an image, then pick the placement, opacity and angle. The preview shows the result on the page before you download. It runs in your browser, so your file isn’t uploaded.
Updated 31 October 2026 · Written by the StackPDF teamUpdated 31 October 2026 · StackPDF team
HOW TO
Drop it here, or choose it from your computer, your phone or My files.
Type text such as DRAFT, or choose a logo. Pick tiled or centered, the opacity and the angle.
The watermark is stamped on every page. The original isn’t changed.
OPTIONS
Every setting shows in the preview as you change it.
| SETTING | CHOICES | TIP |
|---|---|---|
| Type | Text or Image | Use a PNG with a transparent background for logos |
| Placement | Tiled or Centered | Tiled is harder to crop out |
| Opacity | Faint 15, Light 25, Medium 50, Strong 80 | Light keeps the page easy to read |
| Angle | Diagonal, Straight or Vertical | Diagonal is the classic DRAFT look |
A watermark is added on top of the page. To make it hard to remove, flatten the PDF afterwards.
PRIVACY
Yes. Add a watermark to a PDF runs in your browser, so the file never leaves your device.
StackPDF opens the PDF in your browser tab and does the work there.
Close the tab and it’s gone. Free results download to your device. Premium can also keep them in My files.
pdf-lib, PDF.js and qpdf do the work, inside your browser.
FAQ
Add the PDF, type the watermark text, choose the placement, opacity and angle, then download. Every page gets the watermark.
Yes. The free plan includes 1 PDF export a day, with no account. Premium removes the daily limit for $5.99 a month or $39.99 a year.
No. The watermark is added in your browser, so the PDF stays on your device.
Yes. Choose Image and pick your logo as a PNG, JPG or WEBP. A PNG with a transparent background looks best.
Someone with a PDF editor can remove one with enough effort. A tiled watermark is the hardest to crop out or cover.
No, the watermark goes on every page. To mark only some, split those pages out, watermark them and merge the file back together.