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.
This page documents the HTTP endpoint POST /api/tools/pdf-watermark/execute. See the MCP reference →
This tool fetches a fixed, hard-coded public upstream — never a private host. Results depend on that upstream.
Call it over REST
POST https://api.findutils.com/api/tools/pdf-watermark/execute · no API keys · 60 requests/min per IP
Execute — verified arguments
curl -X POST https://api.findutils.com/api/tools/pdf-watermark/execute \
-H "Content-Type: application/json" \
-d '{
"pdf": "JVBERi0xLjcK",
"text": "CONFIDENTIAL"
}'Parameter schema for this endpoint
curl https://api.findutils.com/api/tools/pdf-watermarkInput schema
| Argument | Type | Required | Description |
|---|---|---|---|
| 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)
{
"pdf": "JVBERi0xLjcK",
"text": "CONFIDENTIAL"
}Also an MCP tool
Claude, Cursor, and any MCP client can call this tool as
findutils:pdf_watermark after one connect command.
Connect once
claude mcp add findutils --transport http https://mcp.findutils.com/More Documents tools
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