# Pdf Watermark — MCP tool `findutils:pdf_watermark`

Stamp text across the pages of a PDF — CONFIDENTIAL, DRAFT, a company name. The text is drawn centred and rotated over the existing content at the opacity you choose, so the page underneath stays readable. Input and output are base64-encoded PDFs. This is a visual mark, not a security control: anyone can remove it with the same kind of tool.

- Category: documents
- MCP server: https://mcp.findutils.com/ (Streamable HTTP, no API keys, 120 req/min per IP)
- REST endpoint: POST https://api.findutils.com/api/tools/pdf-watermark/execute (no API keys, 60 req/min per IP)
- Network tool: fetches a fixed, hard-coded public upstream (never a private host).
- Reference page: https://findutils.com/mcp/pdf-watermark/
- Same tool on the other surface: https://findutils.com/api/pdf-watermark/

## Connect

```bash
claude mcp add findutils --transport http https://mcp.findutils.com/
```

Claude Desktop (`claude_desktop_config.json`):

```json
{
  "mcpServers": {
    "findutils": {
      "url": "https://mcp.findutils.com/"
    }
  }
}
```

## Call the tool (verified example)

```bash
curl -X POST https://mcp.findutils.com/ \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "tools/call",
    "params": {
      "name": "pdf_watermark",
      "arguments": {
        "pdf": "JVBERi0xLjcK",
        "text": "CONFIDENTIAL"
      }
    }
  }'
```

## Input schema

| Argument | Type | Required | Description |
|---|---|---|---|
| `pdf` | string | yes | The base64-encoded PDF to stamp. |
| `text` | string | yes | The watermark text. |
| `opacity` | number | no |  0 is invisible, 1 is solid. Default: 0.15. Default: `0.15`. |
| `rotation` | integer | no | Degrees anticlockwise. Default: 45. Default: `45`. |
| `size` | number | no | Font size in points. Default: 0, meaning fit to the page width. Default: `0`. |
| `color` | string | no | Hex colour such as #808080. Default: #808080. Default: `"#808080"`. |
| `pages` | string | no | Pages to stamp, 1-based: "1,3,5-8". Default: every page. |

Example arguments (verified):

```json
{
  "pdf": "JVBERi0xLjcK",
  "text": "CONFIDENTIAL"
}
```

## Also a REST endpoint

```bash
curl -X POST https://api.findutils.com/api/tools/pdf-watermark/execute \
  -H "Content-Type: application/json" \
  -d '{
    "pdf": "JVBERi0xLjcK",
    "text": "CONFIDENTIAL"
  }'

# Parameter schema
curl https://api.findutils.com/api/tools/pdf-watermark
```

Full REST reference: https://findutils.com/api/pdf-watermark/ · OpenAPI 3.1 spec: https://findutils.com/api/openapi.json

---
Full catalog: POST https://mcp.findutils.com/ with method `tools/list` · https://findutils.com/mcp/ · https://findutils.com/llms.txt