Groupdocs Watermark MCP

Name: Groupdocs Watermark MCP
Author: groupdocs-watermark

by groupdocs-watermarkversion 26.9.0i★ –iRuns on your computer

Registry nameio.github.groupdocs-watermark/groupdocs-watermark-mcp

Install

Overview

Description from the maker (original English)

MCP server for GroupDocs.Watermark — add and search document watermarks via AI agents.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Docs, sheets & office work

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: GROUPDOCS_MCP_STORAGE_PATH, GROUPDOCS_MCP_OUTPUT_PATH, GROUPDOCS_LICENSE_PATH, GROUPDOCS_METERED_PUBLIC_KEY, GROUPDOCS_METERED_PRIVATE_KEY

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "groupdocs-watermark": {
      "command": "dnx",
      "args": [
        "GroupDocs.Watermark.Mcp",
        "--yes"
      ],
      "env": {
        "GROUPDOCS_MCP_STORAGE_PATH": "your-value",
        "GROUPDOCS_MCP_OUTPUT_PATH": "your-value",
        "GROUPDOCS_LICENSE_PATH": "your-value",
        "GROUPDOCS_METERED_PUBLIC_KEY": "your-value",
        "GROUPDOCS_METERED_PRIVATE_KEY": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add groupdocs-watermark --env GROUPDOCS_MCP_STORAGE_PATH=your-value --env GROUPDOCS_MCP_OUTPUT_PATH=your-value --env GROUPDOCS_LICENSE_PATH=your-value --env GROUPDOCS_METERED_PUBLIC_KEY=your-value --env GROUPDOCS_METERED_PRIVATE_KEY=your-value -- dnx GroupDocs.Watermark.Mcp --yes

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "groupdocs-watermark": {
      "command": "dnx",
      "args": [
        "GroupDocs.Watermark.Mcp",
        "--yes"
      ],
      "env": {
        "GROUPDOCS_MCP_STORAGE_PATH": "your-value",
        "GROUPDOCS_MCP_OUTPUT_PATH": "your-value",
        "GROUPDOCS_LICENSE_PATH": "your-value",
        "GROUPDOCS_METERED_PUBLIC_KEY": "your-value",
        "GROUPDOCS_METERED_PRIVATE_KEY": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "groupdocs-watermark": {
      "type": "stdio",
      "command": "dnx",
      "args": [
        "GroupDocs.Watermark.Mcp",
        "--yes"
      ],
      "env": {
        "GROUPDOCS_MCP_STORAGE_PATH": "your-value",
        "GROUPDOCS_MCP_OUTPUT_PATH": "your-value",
        "GROUPDOCS_LICENSE_PATH": "your-value",
        "GROUPDOCS_METERED_PUBLIC_KEY": "your-value",
        "GROUPDOCS_METERED_PRIVATE_KEY": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

GROUPDOCS_MCP_STORAGE_PATH env
GROUPDOCS_MCP_OUTPUT_PATH env
GROUPDOCS_LICENSE_PATH env
GROUPDOCS_METERED_PUBLIC_KEY env
GROUPDOCS_METERED_PRIVATE_KEY env

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 6, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account groupdocs-watermark, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Docs, sheets & office worki

More stars than 0% of the other 2177 servers in this category
Published to the registry more recently than 34% of the other 2177 servers in this category
Basic checks equal to or better than 100% of the other 2177 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Groupdocs Watermark MCP safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (26.9.0) reached the registry 2 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need .NET on your computer.

What can I use instead?

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

GroupDocs.Watermark MCP Server

MCP server that exposes GroupDocs.Watermark as AI-callable tools for Claude, Cursor, GitHub Copilot, and other MCP agents.

Installation

One-click installs pre-fill every supported setting: edit the placeholder documents

folder after install (output defaults to the same folder); an empty

GROUPDOCS_LICENSE_PATH runs in evaluation mode - point it at your license to lift limits.

More clients - ready-made configs for Claude Code, Codex CLI, Visual Studio 2022,

Cursor, Windsurf, Cline, and JetBrains Rider live in install/generated/.

Requires .NET 10 SDK.

Run directly with `dnx` (recommended — no install step):

dnx GroupDocs.Watermark.Mcp --yes

Pulls the latest stable release on every invocation. To pin to a specific version (recommended for shared configs and CI), append @ :

dnx GroupDocs.Watermark.Mcp@26.9.0 --yes

Or install as a global dotnet tool:

dotnet tool install -g GroupDocs.Watermark.Mcp

groupdocs-watermark-mcp

Or run via Docker:

docker run --rm -i \

-v $(pwd)/documents:/data \ ghcr.io/groupdocs-watermark/watermark-net-mcp:latest

Native prerequisites

The underlying GroupDocs engine uses System.Drawing (GDI+) for some operations. When you run the server natively (via dnx or the global dotnet tool) on Linux or macOS, install the native libgdiplus library first:

Platform	Setup
Windows	Nothing — GDI+ is built into the OS.
Linux	`sudo apt-get install -y libgdiplus libfontconfig1 ttf-mscorefonts-installer`
macOS	`brew install mono-libgdiplus`
Docker	Nothing — the image already bundles `libgdiplus`.

Skipping this on Linux/macOS surfaces as DllNotFoundException: libgdiplus in the tool response. The simplest zero-setup option on Linux/macOS is the Docker image.

Available MCP Tools

Tool	Description
`AddWatermark`	Adds a text watermark (Arial, configurable size + rotation) to a document and saves the watermarked file to storage
`AddImageWatermark`	Adds an image watermark (logo, signature scan, stamp) to a document and saves the watermarked file. Configurable opacity + rotation
`SearchWatermarks`	Finds existing watermarks (text + image) in a document and returns their details (type, text, page, position, size, rotation) as JSON
`RemoveWatermarks`	Removes existing watermarks from a document and saves the cleaned copy. Optional text filter to remove only matching watermarks
`GetDocumentInfo`	Returns the file type, page count, and per-page dimensions of a document as JSON — without modifying it

All tools support PDF, DOCX, XLSX, PPTX, PNG, JPG, VSDX, and 50+ more document and image formats.

Example prompts for AI agents

Copy any of these into Claude Desktop, Cursor, or GitHub Copilot Chat after the server is connected. The AI agent will pick the right tool and arguments automatically — file names are resolved against GROUPDOCS_MCP_STORAGE_PATH.

Add a DRAFT text watermark: *"Add a watermark with the text 'DRAFT' to report.pdf."*
Stamp a logo image: *"Use company-logo.png as an image watermark on every page of contract.docx, opacity 30%."*
Inspect existing watermarks: *"What watermarks does invoice.pdf contain?"*
Strip old watermarks: *"Remove all watermarks from final-draft.docx so I can ship it."*
Inspect document structure: *"How many pages does presentation.pptx have, and what are their dimensions?"*

Licensing

The MCP server itself is MIT; the underlying GroupDocs.Watermark engine requires a license for production use. Without one the server runs in evaluation mode:

The engine adds an extra evaluation watermark to processed output.
A single server process can load at most 10 documents; further calls fail until the server restarts.

There are two ways to license the server.

License file — point GROUPDOCS_LICENSE_PATH at your GroupDocs.Total.lic. Works offline.

Metered (pay-per-use) — set both GROUPDOCS_METERED_PUBLIC_KEY and GROUPDOCS_METERED_PRIVATE_KEY. You are billed for what you actually process, which suits AI agents well because their usage is bursty and hard to predict up front. If both a metered key pair and a license file are configured, metered wins and the file is ignored.

Metered mode needs outbound connectivity. Usage is reported to GroupDocs servers, so

air-gapped or firewalled deployments must allow that egress — or use a license file instead.

Call the `get_license_status` tool at any time to see which mode is active, and — under metered — the consumed quantity and remaining credit.

Keeping the private key out of your config

The metered private key is a secret. MCP client configs are plain files on disk, and a project-scoped .mcp.json is committed by convention, so prefer, in order:

Set the variables in your OS environment and leave them out of the config entirely. An stdio MCP server inherits its client's environment, so this works in every client. On macOS note that an app launched from Finder does not inherit shell exports — use launchctl setenv, or launch the client from a terminal.
Reference them indirectly if your client supports it (Claude Code expands ${VAR}; VS Code uses ${env:VAR} and ${input:...}).
A literal value in a user-scoped config (for example ~/.claude.json) is acceptable for a single developer.
Never commit a literal key in a project-scoped .mcp.json.

For Docker, forward the values without writing them into any file:

docker run --rm -i \

-e GROUPDOCS_METERED_PUBLIC_KEY -e GROUPDOCS_METERED_PRIVATE_KEY \ -v /path/to/documents:/data \ ghcr.io/groupdocs-watermark/watermark-net-mcp:latest

To lift the limits with a license file:

Configuration

Variable	Description	Default
`GROUPDOCS_MCP_STORAGE_PATH`	Base folder for input and output files	current directory
`GROUPDOCS_MCP_OUTPUT_PATH`	(Optional) separate folder for output files	`GROUPDOCS_MCP_STORAGE_PATH`
`GROUPDOCS_LICENSE_PATH`	Path to GroupDocs license file. In evaluation mode, output documents may include an additional evaluation watermark alongside the user-requested one	(evaluation mode)
`GROUPDOCS_METERED_PUBLIC_KEY`	Metered public key. Requires the private key too; takes precedence over the license file	(unset)
`GROUPDOCS_METERED_PRIVATE_KEY`	Metered private key. Secret - see Licensing	(unset)

Usage with Claude Desktop

"mcpServers": { "groupdocs-watermark": { "type": "stdio", "command": "dnx", "args": ["GroupDocs.Watermark.Mcp", "--yes"], "env": { "GROUPDOCS_MCP_STORAGE_PATH": "/path/to/documents" } } } }

To pin to a specific version, replace "GroupDocs.Watermark.Mcp" with

"GroupDocs.Watermark.Mcp@26.9.0" in args. Pinning is recommended for

shared / committed configs to avoid surprise upgrades.

Usage with VS Code / GitHub Copilot

NuGet.org generates a ready-to-use mcp.json snippet on the package page. Copy it directly into your .vscode/mcp.json.

Alternatively, add manually to .vscode/mcp.json:

"inputs": [ { "type": "promptString", "id": "storage_path", "description": "Base folder for input and output files.", "password": false } ], "servers": { "groupdocs-watermark": { "type": "stdio", "command": "dnx", "args": ["GroupDocs.Watermark.Mcp", "--yes"], "env": { "GROUPDOCS_MCP_STORAGE_PATH": "${input:storage_path}" } } } }

Same pinning rule as above — swap "GroupDocs.Watermark.Mcp" for

"GroupDocs.Watermark.Mcp@26.9.0" to lock to a specific release.

Usage with Docker Compose

cd docker

docker compose up

Edit docker/docker-compose.yml to point volumes at your local documents folder.

Documentation & guides

Step-by-step deployment guides and a published-package integration test suite live in the companion repo GroupDocs.Watermark.Mcp.Tests:

Install from NuGet — dnx, global tool, pinned vs always-latest
Run via Docker
Verify on the MCP registry
[Use with Claude Desktop](https://github.com/groupdocs-watermark/GroupDocs.Watermark.Mcp.Tests/blob/master/how-to/04-use-with-claude-des

Only the beginning is shown; read the rest in the repo

Groupdocs Watermark MCP

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Docs, sheets & office worki

Common questions

Alternatives

Agent-Native Calendar

Excel MCP Server

MCP Server for Excel

README from the maker

GroupDocs.Watermark MCP Server

Installation

Native prerequisites

Available MCP Tools

Example prompts for AI agents

Licensing

Keeping the private key out of your config

Configuration

Usage with Claude Desktop

Usage with VS Code / GitHub Copilot

Usage with Docker Compose

Documentation & guides