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Add Watermark

Stamp text or image watermarks.

Runs in your browserIn: PDFOut: PDF
Runs in your browser — your file never leaves your device.

About this tool

Overlay a text or image watermark with adjustable opacity, rotation, and tiling.

This tool processes files entirely on your device. Nothing is uploaded to a server.

How it works

  1. 1Open the tool and pick your PDF file — it stays on your device.
  2. 2Choose your options.
  3. 3Run the tool in your browser.
  4. 4Save the result to your device.

What this tool can do

Colors
Gray, red, or blue watermark text, placed diagonally across each page.

Common questions

Is my file uploaded when I use Add Watermark?

No. This tool runs entirely in your browser with WebAssembly and browser APIs — the file stays on your device from start to finish.

Does Add Watermark work offline?

Not fully — the page and its processing engine load over the network, with the engine fetched when you first use the tool. After that, the processing itself runs entirely on your device, and a dropped connection does not interrupt work in progress.

How large can my file be?

Up to 100 MB per file.

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No sign-up required. Your files stay on your device until you run a tool.