Media

Convert WebP with Quality Adjustment

Adjust WebP image quality with lossless, lossy, and near-lossless options

file· File resultOpen tool

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/webp-to-quality-adjusted-webp' \
  -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/webp-to-quality-adjusted-webp' \
  -F 'imageFile=uploads/2026/01/01/your-tool-1700000000000-abc123.ext' \
  -F 'quality=85' \
  -F 'lossless=false' \
  -F 'nearLossless=false' \
  -F 'effort=4' \
  -F 'smartSubsample=false' \
  -F 'alphaQuality=85'

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/webp-to-quality-adjusted-webp

Parameters

Name	Type	Required	Description
imageFile	fileupload required	Yes	—
quality	range	No	Lower values reduce file size, higher values increase quality. Auto-adjusted for lossless modes.
lossless	checkbox	No	Compress without any quality loss. Quality will be set to 100.
nearLossless	checkbox	No	Almost perfect quality with good compression. Minimum quality set to 85.
effort	range	No	Higher values = better compression but slower processing
smartSubsample	checkbox	No	Optimize color channel processing for potentially better quality
alphaQuality	range	No	Quality setting for alpha/transparency channel when present

File-type parameters must be uploaded first via POST /upload/webp-to-quality-adjusted-webp, 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-webp-to-quality-adjusted-webp": {
      "name": "webp-to-quality-adjusted-webp",
      "description": "Adjust WebP image quality with lossless, lossy, and near-lossless options",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=webp-to-quality-adjusted-webp",
      "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": "webp-to-quality-adjusted-webp",
    "arguments": {
  "imageFile": "https://example.com/file.ext",
  "quality": 85,
  "lossless": false,
  "nearLossless": false,
  "effort": 4,
  "smartSubsample": false,
  "alphaQuality": 85
}
  }
}

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]