ConvertOnline

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1. Convert Online
2. Audio Converters
3. M4A to M4R

{
  "convert": "m4a-m4r",
  "multiple": true,
  "from": "m4a",
  "to": "m4r",
  "note": "The .m4r format is used for iPhone ringtones and is essentially an AAC-encoded file with a different extension. For compatibility, it's recommended to keep duration under 40 seconds.",
  "controls": [
    {
      "type": "dropdown",
      "name": "bitrate",
      "label": "Audio Bitrate",
      "options": [
        {
          "label": "64 kbps",
          "value": "64k"
        },
        {
          "label": "96 kbps",
          "value": "96k"
        },
        {
          "label": "128 kbps (Standard)",
          "value": "128k"
        },
        {
          "label": "192 kbps",
          "value": "192k"
        }
      ],
      "defaultValue": "128k",
      "desc": "Sets the output bitrate for the ringtone. 128 kbps is standard and works well on iPhones."
    },
    {
      "type": "dropdown",
      "name": "channels",
      "label": "Audio Channels",
      "options": [
        {
          "label": "Mono (1 channel)",
          "value": 1
        },
        {
          "label": "Stereo (2 channels)",
          "value": 2
        }
      ],
      "defaultValue": 2,
      "desc": "Choose mono or stereo output. Stereo provides better sound quality, while mono reduces file size."
    },
    {
      "type": "dropdown",
      "name": "sample_rate",
      "label": "Sample Rate (Hz)",
      "options": [
        {
          "label": "22050 Hz",
          "value": 22050
        },
        {
          "label": "44100 Hz (Standard)",
          "value": 44100
        },
        {
          "label": "48000 Hz",
          "value": 48000
        }
      ],
      "defaultValue": 44100,
      "desc": "Defines the audio sample rate. 44100 Hz is standard for AAC files and is compatible with iOS."
    },
    {
      "type": "number",
      "name": "duration",
      "label": "Clip Duration (seconds)",
      "range": {
        "min": 1,
        "max": 40
      },
      "unit": "sec",
      "defaultValue": 30,
      "desc": "Limit the ringtone length to 40 seconds for iPhone compatibility. Anything longer may not be accepted by iOS."
    }
  ],
  "type": "audio"
}