MostlyPDF

Watermark PDF

Stamp a text watermark across every page with adjustable opacity, then download.

Open Watermark PDF

How to use Watermark PDF

  1. Add your fileDrop your PDF onto the Watermark PDF tool, or browse to select. It opens in your browser — nothing is uploaded.
  2. Set your optionsChoose how you want Watermark PDF to run — the options that matter, nothing more.
  3. DownloadRun the tool and download your finished file instantly.
Accepts
One PDF
Gives you
The PDF with a text watermark on every page
Where it runs
In your browser — the file never leaves your device
Price
Free — no sign-up, no watermark

Common questions

Is Watermark PDF free?

Yes — Watermark PDF is free with no sign-up, no watermark and no daily limit on this tool. Heavier operations (OCR, conversion) have a generous daily quota on the free plan and are unlimited on Pro.

How do I add watermark to pdf?

Open Watermark PDF, drop your file, set the options, and download the result in a few seconds — processed securely, no queue and no ads.

Does Watermark PDF upload my file?

No. Watermark PDF runs entirely in your browser: the PDF is processed on your own device and is never sent to our servers, so it also works on confidential documents. If your browser cannot run it, the tool asks before using our server instead — nothing is uploaded unless you agree.

Can I make the watermark faint enough to read through?

Yes. The opacity is adjustable, so a DRAFT or CONFIDENTIAL stamp can sit over the page without making the text underneath hard to read.

Can the watermark be removed later?

Not from the file you download — the watermark is drawn into the page content. Keep your unwatermarked original if you will need a clean copy.

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