ConvertOnline

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1. Convert Online
2. Audio Converters
3. M4R to MP3

{
  "convert": "m4r-mp3",
  "multiple": true,
  "from": "m4r",
  "to": "mp3",
  "note": "M4R is a custom iPhone ringtone format based on AAC. This conversion makes the audio playable on most devices by converting it to MP3. Note that original ringtone metadata may be lost.",
  "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"
        },
        {
          "label": "256 kbps",
          "value": "256k"
        },
        {
          "label": "320 kbps (High)",
          "value": "320k"
        }
      ],
      "defaultValue": "128k",
      "desc": "Sets the output MP3 bitrate. Higher bitrates increase audio quality and file size. 128 kbps is standard."
    },
    {
      "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 in the output. Stereo retains full sound quality, mono reduces size."
    },
    {
      "type": "dropdown",
      "name": "sample_rate",
      "label": "Sample Rate (Hz)",
      "options": [
        {
          "label": "22050 Hz",
          "value": 22050
        },
        {
          "label": "44100 Hz (CD Quality)",
          "value": 44100
        },
        {
          "label": "48000 Hz",
          "value": 48000
        }
      ],
      "defaultValue": 44100,
      "desc": "Defines how many samples per second the output MP3 will have. 44100 Hz is standard for audio playback."
    }
  ],
  "type": "audio"
}