Design

Image Watermark Opacity

Add watermarks with custom opacity to images, supporting both text and image watermarks with advanced opacity controls

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-opacity' \
  -F 'file=@/path/to/imageFile.ext'
curl -X POST 'https://api.elysiatools.com/upload/image-watermark-opacity' \
  -F 'file=@/path/to/watermarkImageFile.ext'

# 2) Call the tool with the returned filePath values
curl -X POST 'https://api.elysiatools.com/en/api/tools/image-watermark-opacity' \
  -F 'imageFile=/path/to/file.ext' \
  -F 'watermarkType=text' \
  -F 'watermarkText=© Watermark' \
  -F 'watermarkImageFile=/path/to/file.ext' \
  -F 'position=bottom-right' \
  -F 'opacity=0.7' \
  -F 'textOpacity=0' \
  -F 'backgroundOpacity=0' \
  -F 'fontSize=40' \
  -F 'fontColor=#ffffff' \
  -F 'backgroundColor=#000000' \
  -F 'rotation=0' \
  -F 'scale=0.2' \
  -F 'margin=20' \
  -F 'blendMode=over' \
  -F 'textStyle=normal' \
  -F 'fontWeight=bold' \
  -F 'textAlign=left' \
  -F 'shadowEnabled=false' \
  -F 'shadowOpacity=0.5' \
  -F 'shadowBlur=3' \
  -F 'shadowOffsetX=2' \
  -F 'shadowOffsetY=2' \
  -F 'gradientEnabled=false' \
  -F 'gradientStartColor=#ffffff' \
  -F 'gradientEndColor=#cccccc' \
  -F 'gradientDirection=horizontal'

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-opacity

Parameters

Name	Type	Required	Description
imageFile	fileupload required	Yes	—
watermarkType	select	Yes	—
watermarkText	text	No	—
watermarkImageFile	fileupload required	No	—
position	select	Yes	—
opacity	number	No	—
textOpacity	number	No	—
backgroundOpacity	number	No	—
fontSize	number	No	—
fontColor	color	No	—
backgroundColor	color	No	—
rotation	number	No	—
scale	number	No	—
margin	number	No	—
blendMode	select	No	—
textStyle	select	No	—
fontWeight	select	No	—
textAlign	select	No	—
shadowEnabled	checkbox	No	—
shadowOpacity	number	No	—
shadowBlur	number	No	—
shadowOffsetX	number	No	—
shadowOffsetY	number	No	—
gradientEnabled	checkbox	No	—
gradientStartColor	color	No	—
gradientEndColor	color	No	—
gradientDirection	select	No	—

File-type parameters must be uploaded first via POST /upload/image-watermark-opacity, 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-opacity": {
      "name": "image-watermark-opacity",
      "description": "Add watermarks with custom opacity to images, supporting both text and image watermarks with advanced opacity controls",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=image-watermark-opacity",
      "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-opacity",
    "arguments": {
  "imageFile": "https://example.com/file.ext",
  "watermarkType": "text",
  "watermarkText": "© Watermark",
  "watermarkImageFile": "https://example.com/file.ext",
  "position": "bottom-right",
  "opacity": 0.7,
  "textOpacity": 0,
  "backgroundOpacity": 0,
  "fontSize": 40,
  "fontColor": "#ffffff",
  "backgroundColor": "#000000",
  "rotation": 0,
  "scale": 0.2,
  "margin": 20,
  "blendMode": "over",
  "textStyle": "normal",
  "fontWeight": "bold",
  "textAlign": "left",
  "shadowEnabled": false,
  "shadowOpacity": 0.5,
  "shadowBlur": 3,
  "shadowOffsetX": 2,
  "shadowOffsetY": 2,
  "gradientEnabled": false,
  "gradientStartColor": "#ffffff",
  "gradientEndColor": "#cccccc",
  "gradientDirection": "horizontal"
}
  }
}

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]