Watermark PDF
Watermark PDF stamps text — like DRAFT, CONFIDENTIAL or your name — across every page of a document. Choose the position, size, opacity, angle and colour, from a single centred stamp to a repeating tiled pattern. It's applied in your browser with pdf-lib, so your file is never uploaded.
Add your PDF
The file is read by your browser and stays on your device — there is no upload step.
Your PDF
The work runs in this tab. Nothing is sent anywhere, and the download is generated locally.
Output —Load a PDF
How to use Watermark PDF
- 01Upload
Add your PDF
Drop a PDF in; the first page previews with your watermark.
- 02Customize
Style the stamp
Type your text and set its position, size, opacity, angle and colour.
- 03Process
Apply
Export to stamp the watermark on every page and download the result.
What a watermark does, and does not do
A watermark states status or ownership — DRAFT, CONFIDENTIAL, a company name. Its job is to travel with the document so any copy carries the label.
A watermark can be removed by anyone with a PDF editor, and it does not stop copying, printing or extracting the text. It is a label, not a lock.
Making it work
- Diagonal across the page
The hardest position to crop out and the clearest signal of status.
- Light enough to read through
Around 10–20% opacity marks the page without making the document hard to read.
- Every page
A watermark on the cover alone is defeated by sending page four.
Worth knowing
Not redaction — If information must not be seen, it has to be removed from the file, not covered. Text under a watermark is still selectable.
It affects printing — A watermark that looks subtle on screen can be heavy on paper. Print one page before committing.
It is permanent here — The mark is drawn into the exported document. Keep the unwatermarked original.
Supported formats
- Maximum file size —
- bounded by your device's memory
- Processed by —
- pdf-lib, on your device
Your file, and what the page does
Your file is never uploaded. Watermark PDF reads it into this browser tab and processes it with pdf-lib on your own device. There is no upload endpoint in the application and no copy on any server — closing the tab discards it.
What the page does send or fetch
- Ads on the page
- The site is funded by advertising, so the page loads Google AdSense. That carries the usual web basics — IP address, browser, referring page — as on any ad-supported site.
- An anonymous usage counter
- When Watermark PDF finishes we record that the tool ran, whether it succeeded and how long it took. No file data, no identifier, no cookie.
Your file is not on that list. How this works.
Frequently asked questions
Yes — the text is stamped on all pages. Choose Tiled to repeat it across each page, or Center/Top/Bottom for a single stamp.
Lower the opacity for a faint background stamp, or raise it for a bold overlay. A diagonal angle is common for draft marks.
No — the watermark is drawn on top; the original page content is untouched and still selectable.
Yes — Watermark PDF is completely free. There's no account, sign-up, watermark or limit.
No. It runs in any modern browser — Chrome, Edge, Safari, Firefox, Brave — with nothing to download or install.
Not sure this is what you need?
- Mark a document as draft or confidentialWatermark PDF
- Add a signatureSign PDF
- Number the pagesAdd Page Numbers
- Remove pages entirelyDelete Pages
Edit any media with a right-click
Add Dexta Studio to Chrome and open any image, video, audio or PDF straight into the right tool — free, nothing uploaded.