Media

Image Resizer

Professional image resizing tool with multiple resize methods, aspect ratio preservation, and format conversion, supporting GIF/Animated WebP/APNG and JPEG/PNG/WEBP.

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-resize' \
  -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-resize' \
  -F 'imageFile=/path/to/file.ext' \
  -F 'resizeMode=pixels' \
  -F 'width=0' \
  -F 'height=0' \
  -F 'aspectRatio=custom' \
  -F 'fit=contain' \
  -F 'position=center' \
  -F 'background=#000000' \
  -F 'blurBackground=true' \
  -F 'blurSigma=20' \
  -F 'kernel=lanczos3' \
  -F 'format=original' \
  -F 'quality=90' \
  -F 'upscale=true' \
  -F 'progressive=false' \
  -F 'stripMetadata=true'

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-resize

Parameters

Name	Type	Required	Description
imageFile	fileupload required	Yes	—
resizeMode	select	No	—
width	number	No	—
height	number	No	—
aspectRatio	select	No	—
fit	select	No	—
position	select	No	—
background	color	No	—
blurBackground	checkbox	No	—
blurSigma	range	No	—
kernel	select	No	—
format	select	No	—
quality	range	No	—
upscale	checkbox	No	—
progressive	checkbox	No	—
stripMetadata	checkbox	No	—

File-type parameters must be uploaded first via POST /upload/image-resize, 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-resize": {
      "name": "image-resize",
      "description": "Professional image resizing tool with multiple resize methods, aspect ratio preservation, and format conversion, supporting GIF/Animated WebP/APNG and JPEG/PNG/WEBP.",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=image-resize",
      "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-resize",
    "arguments": {
  "imageFile": "https://example.com/file.ext",
  "resizeMode": "pixels",
  "width": 0,
  "height": 0,
  "aspectRatio": "custom",
  "fit": "contain",
  "position": "center",
  "background": "#000000",
  "blurBackground": true,
  "blurSigma": 20,
  "kernel": "lanczos3",
  "format": "original",
  "quality": 90,
  "upscale": true,
  "progressive": false,
  "stripMetadata": true
}
  }
}

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]