How to watermark documents with AI agents using MCP Leave feedback

Watermarking through an agent is the small task nobody schedules and everybody needs: mark this before it goes out, brand these before the client sees them, stamp DRAFT until it is approved.

Note

The commands and config snippets on this page are for the .NET build of the server — the only platform available today. Installation and client setup: MCP server for .NET. Other platforms will expose the same tools with their own launch command; everything else on this page applies unchanged.

1. Put the document in the storage folder the server can see.
2. Ask: “Add a diagonal CONFIDENTIAL watermark to contract.pdf.”
3. The agent calls add_watermark with the text, a font size, and a rotation.
4. A watermarked copy appears in your output folder; the original is untouched.

rotation: -45 gives the classic diagonal. For image watermarks, opacity between 0.2 and 0.4 usually reads as branding rather than as an obstruction.

Every call writes a new file. To put a logo and a text mark on the same document, the second call must take the file the first one produced:

Add the logo at 30% opacity, then add a DRAFT text watermark to that result.

Without “to that result”, the second call starts from the original and only the DRAFT survives.

Unlicensed output carries evaluation limitations — which on a watermarking tool means the copies you were about to distribute are not distributable. One call to get_license_status settles it; see Licensing.

dnx GroupDocs.Watermark.Mcp --yes

with GROUPDOCS_MCP_STORAGE_PATH pointing at your documents folder — per-client config or the installer.

• Batch-watermark a folder — the whole distribution set in one prompt.
• Find and remove watermarks — and what cannot be removed.
• Brand documents with a logo — opacity, placement, and taste.
• On-premise architecture — nothing leaves the machine.