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Design

Image Rounded Corners

Add rounded corner effects to images with adjustable radius and corner selection

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Quick start

Call this tool from your code in three languages.

cURL
# 1) Request a presigned URL → returns { uploadUrl, storageKey }
curl -X POST 'https://api.elysiatools.com/api/upload/presign/image-rounded-corners' \
  -H 'Content-Type: application/json' \
  -d '{"filename":"imageFile.ext","contentType":"application/octet-stream","size":12345}'

# 2) PUT the file bytes directly to the presigned uploadUrl
curl -X PUT '<presigned uploadUrl>' \
  --data-binary @/path/to/file.ext

# 3) Call the tool, passing the returned storageKey for each file field
curl -X POST 'https://api.elysiatools.com/en/api/tools/image-rounded-corners' \
  -F 'imageFile=uploads/2026/01/01/your-tool-1700000000000-abc123.ext' \
  -F 'radius=10' \
  -F 'cornerMode=all' \
  -F 'topLeft=0' \
  -F 'topRight=0' \
  -F 'bottomLeft=0' \
  -F 'bottomRight=0' \
  -F 'backgroundColor=#ffffff' \
  -F 'format=original' \
  -F 'quality=90'

© 2026 Elysia Tools. Developer documentation.

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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-rounded-corners

Parameters

NameTypeRequiredDescription
imageFilefileupload requiredYesUpload any image file (JPEG, PNG, WebP, GIF, BMP, TIFF) to apply rounded corners
radiusnumberNoRadius of rounded corners. Will be limited to image dimensions
cornerModeselectYesChoose which corners to apply rounded effect to
topLeftnumberNoRadius for top left corner. Used only in custom mode
topRightnumberNoRadius for top right corner. Used only in custom mode
bottomLeftnumberNoRadius for bottom left corner. Used only in custom mode
bottomRightnumberNoRadius for bottom right corner. Used only in custom mode
backgroundColorcolorNoBackground color for corners (only affects JPEG format)
formatselectNoChoose output format or keep original. PNG recommended for transparency
qualitynumberNoOutput quality for lossy formats (JPEG, WebP). Higher = better quality but larger file size
File-type parameters must be uploaded first via POST /upload/image-rounded-corners, 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-rounded-corners": {
      "name": "image-rounded-corners",
      "description": "Add rounded corner effects to images with adjustable radius and corner selection",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=image-rounded-corners",
      "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-rounded-corners",
    "arguments": {
  "imageFile": "https://example.com/file.ext",
  "radius": 10,
  "cornerMode": "all",
  "topLeft": 0,
  "topRight": 0,
  "bottomLeft": 0,
  "bottomRight": 0,
  "backgroundColor": "#ffffff",
  "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).
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]

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