PNG to ICO API

Endpoint

Authentication is optional for guests and recommended for production. Send either an API key or a JWT access token as a Bearer token. Authenticated requests deduct 1 credit from your balance; failed conversions are refunded. See Authentication for details.

The same request in every supported language. Each example uploads a file and prints the downloadUrl from the response.

curl -X POST https://api.fileswitch.co/api/v1/converter/png-to-ico \
  -H "Authorization: Bearer fc_YOUR_API_KEY" \
  -F "file=@input.png" \
  -F "sizes=16,32,48,64,128,256"

Parameters

Send file plus any optional options. Every option is optional and falls back to its default when omitted.

{
  "file": "input.png",
  "sizes": "16,32,48,64,128,256",
  "square": false
}

Response

Every conversion endpoint returns the same success / message / data envelope. The data object is a Conversion record with a temporary downloadUrl.

{
  "success": true,
  "message": "Conversion completed",
  "data": {
    "id": "b10a5f2e-8c1e-4b3a-9c1d-2e3f4a5b6c7d",
    "inputFormat": "html",
    "outputFormat": "pdf",
    "inputFileName": "document.html",
    "outputFileName": "document.pdf",
    "inputFileSize": 45210,
    "outputFileSize": 88431,
    "status": "completed",
    "error": null,
    "creditCost": 2,
    "downloadUrl": "/api/v1/converter/download/conversions%2Fb10a5f2e-8c1e-4b3a-9c1d-2e3f4a5b6c7d%2Foutput.pdf",
    "createdAt": "2026-07-31T13:00:00.000Z",
    "completedAt": "2026-07-31T13:00:02.000Z"
  }
}

Prepend https://api.fileswitch.co/api/v1 to the downloadUrl and download with the same credentials. Files are retained temporarily and auto-deleted. See the full field reference in Response Schema.

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