Image Canvas Extender

Basic image canvas extension tool for adding space around images with various fill strategies

file· File result

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-extend' \
  -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-extend' \
  -F 'imageFile=/path/to/file.ext' \
  -F 'extendMode=uniform' \
  -F 'extendWith=background' \
  -F 'backgroundColor=#ffffff' \
  -F 'uniformPadding=50' \
  -F 'topPadding=0' \
  -F 'rightPadding=0' \
  -F 'bottomPadding=0' \
  -F 'leftPadding=0' \
  -F 'format=original' \
  -F 'quality=90'

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-extend

Parameters

Name	Type	Required	Description
imageFile	fileupload required	Yes	Upload any image file (JPEG, PNG, WebP, TIFF, GIF, BMP)
extendMode	select	Yes	Choose how to extend the image canvas
extendWith	select	Yes	Choose how to fill the extended area
backgroundColor	color	No	Background color for the extended area (default: white)
uniformPadding	number

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-extend": {
      "name": "image-extend",
      "description": "Basic image canvas extension tool for adding space around images with various fill strategies",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=image-extend",
      "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-extend",
    "arguments": {
  "imageFile": "https://example.com/file.ext",
  "extendMode": "uniform",
  "extendWith": "background",
  "backgroundColor": "#ffffff",
  "uniformPadding": 50,
  "topPadding": 0,
  "rightPadding": 0,
  "bottomPadding": 0,
  "leftPadding": 0,
  "format": "original",
  "quality": 90
}
  }
}

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).

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)"
}

Image Canvas Extender — API & MCP | Elysia Tools