Design

Image Watermark Tool

Add text watermarks to images with customizable position, color, size, and transparency

file· File resultOpen tool

Quick start

Call this tool from your code in three languages.

cURL

# 1) Upload each file first → returns { filePath }
curl -X POST 'https://api.elysiatools.com/upload/image-watermark' \
  -F 'file=@/path/to/imageFile.ext'

# 2) Call the tool with the returned filePath values
curl -X POST 'https://api.elysiatools.com/en/api/tools/image-watermark' \
  -F 'imageFile=/path/to/file.ext' \
  -F 'watermarkText=© Watermark' \
  -F 'position=bottom-right' \
  -F 'fontSize=40' \
  -F 'fontColor=#ffffff' \
  -F 'opacity=0.7' \
  -F 'rotation=0' \
  -F 'backgroundColor=#000000' \
  -F 'backgroundOpacity=0.3'

API reference

Send a POST request with your inputs as JSON. File parameters require a separate upload first.

Endpoint

HTTP

POST https://api.elysiatools.com/en/api/tools/image-watermark

Parameters

Name	Type	Required	Description
imageFile	fileupload required	Yes	—
watermarkText	text	Yes	—
position	select	Yes	—
fontSize	number	No	—
fontColor	color	No	—
opacity	number	No	—
rotation	number	No	—
backgroundColor	color	No	—
backgroundOpacity	number	No	—

File-type parameters must be uploaded first via POST /upload/image-watermark, then the returned filePath is passed to the corresponding file field.

Response format

File result

JSON

{
  "filePath": "/public/processing/randomid.ext",
  "fileName": "output.ext",
  "contentType": "application/octet-stream",
  "size": 1024,
  "metadata": {
    "key": "value"
  },
  "error": "Error message (optional)",
  "message": "Notification message (optional)"
}

MCP integration

Add this tool to your Model Context Protocol server so AI agents can list and call it.

Server configuration

Add this block to your MCP client configuration:

mcp.json

{
  "mcpServers": {
    "elysiatools-image-watermark": {
      "name": "image-watermark",
      "description": "Add text watermarks to images with customizable position, color, size, and transparency",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=image-watermark",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

List available tools

After connecting to the SSE endpoint, list the exposed tools:

tools/list

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list"
}

Call this tool

Invoke the tool by its id, passing arguments built from its parameters:

tools/call

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "image-watermark",
    "arguments": {
  "imageFile": "https://example.com/file.ext",
  "watermarkText": "© Watermark",
  "position": "bottom-right",
  "fontSize": 40,
  "fontColor": "#ffffff",
  "opacity": 0.7,
  "rotation": 0,
  "backgroundColor": "#000000",
  "backgroundOpacity": 0.3
}
  }
}

Chain multiple tools in one session with a comma-separated toolId list, e.g. /mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp (max 20).

File parameters accept a public file URL only (https://…). Local paths, data: URIs, and Base64 strings are not supported.

Questions or issues? Contact [email protected]