Media
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). | Padding to add on all sides when using uniform mode |
| topPadding | number | No | Padding to add to the top edge |
| rightPadding | number | No | Padding to add to the right edge |
| bottomPadding | number | No | Padding to add to the bottom edge |
| leftPadding | number | No | Padding to add to the left edge |
| format | select | No | Choose output format or keep original |
| quality | number | No | Output quality for lossy formats (JPEG, WebP). Higher = better quality but larger file size |
File-type parameters must be uploaded first via POST /upload/image-extend, 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)"
}
File parameters accept a public file URL only (https://…). Local paths, data: URIs, and Base64 strings are not supported.
Image Canvas Extender — API & MCP | Elysia Tools