Watermark PDF
Stamp text or image watermarks onto chosen PDF pages, locally.
Browser onlyYour data never leaves this device.
Loading, stamping, and encoding all run in your browser, in a background worker when available. The document and the mark image never leave the device.
Details: Privacy policy
Input
Drop files here or Browse
Drag and drop works here too.One non-encrypted PDF up to 100 MB and 1,000 pages.
0 is invisible, 100 fully covers.
Text uses the standard Latin font: Latin letters, digits, and common punctuation render; anything else is refused with the characters named, and an image mark sidesteps the question entirely. The stamp is a visual overlay — it identifies, it never protects: anyone can cover or remove it, and this tool claims no removal story either way. Nothing is uploaded.
Result
No watermark yet.
Choose a PDF to watermark.
Watermark PDF stamps text or an image onto the pages you choose, at an opacity you set, as a visual overlay on a new copy of the document. The page is careful about what that means: a watermark identifies, it does not protect, and removal is always possible for anyone who has the file. Text marks use the standard Latin font, so Latin letters, digits and common punctuation render while anything else is refused with the characters named rather than replaced by boxes. Opacity runs from zero to a hundred percent, and even zero writes an invisible overlay object rather than skipping the page, which is stated because it is surprising. It is the tool for marking a draft circulated for comment, for labelling a sample that should not be mistaken for the final, and for putting a client name on a preview. Everything is stamped locally in your browser and nothing is uploaded.
Key facts
- Input
- PDF, Optional PNG or JPEG mark
- Output
- PDF with a text or image watermark
- Limits
- The stamp is a visual overlay at 0–100 opacity — it identifies, it never protects, and removal is always possible. Opacity 0 still writes an (invisible) overlay object; it does not skip the page.
- Processing
- In your browser — nothing is uploaded
- Sign-up
- Not required
- Cost
- Free
Limits above are read from the same code that enforces them; formats are the ones the tool accepts and produces.
How to use Watermark PDF
- Drop one PDF and read its page count.
- Describe the mark — text or image — plus pages, opacity, angle, and position.
- Stamp the pages and download the new file.
What you get
- Text or image watermarks stamped onto the pages you choose, at an opacity you set.
- A refusal of characters outside the standard Latin font, naming the characters that cannot render.
- An honest description of the mark as a visual overlay that identifies rather than protects.
When to use Watermark PDF
- Stamp DRAFT diagonally across a contract draft before circulating it.
- Place a small logo on every page of a portfolio export.
- Mark preview copies with a recipient name so leaks trace back.
- Mark a draft circulated for comment so a screenshot of it is recognisable as unfinished.
Frequently asked questions about Watermark PDF
Does a watermark protect my PDF?
No. It is a visual overlay that anyone can cover, crop, or remove. It identifies copies; it enforces nothing.
Why was my text refused?
Text marks use the standard Latin font. Characters outside it are named in the error — switch to Latin text or use an image mark instead.
Which pages get stamped?
Exactly the ones you list, like 1,3-5, in 1-based numbering. Every other page is copied through untouched.
Is anything uploaded?
Nothing. Loading, stamping, and encoding run in your browser — in a background worker when one is available — and bytes are released on clear.
Guides that compare Watermark PDF
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