ConvertOnline

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Audio

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Document

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

{
  "convert": "aac-m4r",
  "multiple": false,
  "from": "aac",
  "to": "m4r",
  "note": "The M4R format is used for iPhone ringtones and typically requires a duration of 40 seconds or less. Ensure your input audio is trimmed accordingly.",
  "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 bitrate for the M4R file. 128 kbps is a good balance for ringtone quality and file size."
    },
    {
      "type": "dropdown",
      "name": "channels",
      "label": "Audio Channels",
      "options": [
        {
          "label": "Mono (1 channel)",
          "value": 1
        },
        {
          "label": "Stereo (2 channels)",
          "value": 2
        }
      ],
      "defaultValue": 2,
      "desc": "Sets the number of audio channels. Stereo may offer richer sound, but mono is sufficient for most ringtones."
    },
    {
      "type": "dropdown",
      "name": "sample_rate",
      "label": "Sample Rate (Hz)",
      "options": [
        {
          "label": "22050 Hz",
          "value": 22050
        },
        {
          "label": "44100 Hz (CD Quality)",
          "value": 44100
        }
      ],
      "defaultValue": 44100,
      "desc": "Specifies the number of samples per second. 44100 Hz is standard for ringtone-quality audio."
    }
  ],
  "type": "audio"
}