Add a watermark to a PDF

CONFIDENTIAL, DRAFT, your name — stamped across every page at the opacity you choose, with a live preview, without the file leaving your device.

Open your network tab while it runs: zero requests. Your document stays yours.

How to watermark a PDF

  1. Select or drop your PDF — it's read by your browser, never sent to a server.
  2. Type the text, tune the look — diagonal or horizontal, three sizes, opacity from 5–60% — the page thumbnails preview the result live.
  3. Stamp → download — the watermark is printed into every page permanently, visible in every viewer and in print.

The documents people watermark — drafts, contracts, confidential decks — are exactly the ones that should never touch a stranger's server. It runs on the same in-browser engine as our PDF merger, PDF splitter, and PDF to Markdown converter — the file never leaves your machine.

Watermarking, answered honestly.

No. The watermark is drawn into the file inside your browser and the result downloads on your device. Open the network tab while it runs: zero requests.
Yes — opacity runs from a whisper (5%) to unmissable (60%), with live preview on every page thumbnail before you commit.
Both. Diagonal runs corner-to-corner like a classic stamp; horizontal sits level across the middle of the page.
It's printed into the page content, so it shows in every viewer and survives printing. Like any visible watermark, it isn't cryptographic protection — determined editing tools can attack it.
Free, no account, no limits — and no ironic watermark advertising us on your watermarked file.
Still something on your mind? Try it yourself — it's free

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Coming soon · Premium

Take every tool offline — native apps for Mac, Windows, Linux, iOS & Android.

  • Every tool on this site, running natively on your device
  • Fully offline — files never even touch a browser tab
  • Batch-process whole folders of documents locally

The native apps will be a one-time paid upgrade when they launch — everything in the browser stays free, always.