Add a watermark to a PDF
Stamp text across pages to mark drafts and confidential files.
Or drop one anywhere on this page
What to know about Watermark PDF
Mark a document as a draft, a copy or confidential. Set your text, then control its position, size, angle and transparency, with a preview of how the mark will sit on the page before you apply it.
How to watermark a PDF
- 1
Open your PDF
Drop in the document you want to mark.
- 2
Set up the watermark
Type your text or pick a preset, then adjust position, size, angle and opacity. The preview shows how the mark will sit on a page.
- 3
Apply and download
The watermark is drawn onto every page and the file is saved to your device.
What Watermark PDF accepts and produces
- Input
- One PDF, and the text you want stamped across its pages.
- Output
- The same document with your text drawn across every page at the position, size, angle and transparency you set.
- Limits
- The watermark is drawn onto the page, so anyone with a PDF editor can remove it again. It marks a document; it does not protect one.
- Offline
- Yes, completely. Drawing text onto a page needs no engine beyond the page itself.
Why Watermark PDF here
- Preview of placement and weight before anything is applied
- Control over position, size, rotation and opacity
- Applied to every page in one pass
- Confidential documents are marked without being uploaded
Where your file goes
Nowhere. This tool runs inside your browser, and the page is served with a policy that forbids it from sending your document anywhere. You can confirm that yourself: open your browser’s developer tools, watch the Network tab, and process a file.
Questions
Can the watermark be removed by someone else?
A watermark is drawn into the page content, so it cannot be toggled off in a viewer. It is a visible deterrent and a clear status marker, not a security control — it can be removed by someone with the right tools and enough determination.
Can I use an image as the watermark?
Not in this version. Text watermarks are supported now, and image watermarks are planned for a later release.
Will the watermark cover my text?
That is up to you. Lower the opacity so the page stays readable through the mark, which is the usual choice for DRAFT or CONFIDENTIAL stamps.
Can I watermark only some pages?
Not in this version — the mark is applied to every page. If you need it on a subset, extract those pages first, watermark them, then merge them back.
Will the watermark show when the document is printed?
Yes. It is drawn into the page content rather than added as a viewer annotation, so it prints exactly as it appears on screen.
Can I change the colour?
Not yet. The mark is a neutral grey chosen to stay legible against both white pages and printed text at any opacity. Colour control is planned.
What opacity should I use?
Around 20 to 30 percent for a mark across body text, which stays clearly visible without making the page hard to read. Go higher for a corner mark that does not overlap content.
Does adding a watermark make the file much bigger?
Barely. The mark is a small amount of text drawn on each page, so the increase is a few kilobytes even on a long document.