Convert M4A to MP3 via API

M4A is Apple's default audio format used by iTunes, Voice Memos, and podcasts. Convert to MP3 for cross-platform sharing and universal device compatibility.

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Loading FFmpeg engine... (~31 MB)

Use the API

curl -X POST https://renderio.dev/v1/commands \
  -H "X-API-KEY: ffsk_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
  "ffmpeg_command": "-i {in_audio} -c:a libmp3lame -q:a 2 {out_audio}",
  "input_files": {
    "in_audio": "https://example.com/input.m4a"
  },
  "output_files": {
    "out_audio": "output.mp3"
  }
}'

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Common Variations

High quality 320kbps

-i input.m4a -c:a libmp3lame -b:a 320k output.mp3

Voice memo optimized (mono 128k)

-i input.m4a -ac 1 -c:a libmp3lame -b:a 128k output.mp3

With metadata preservation

-i input.m4a -c:a libmp3lame -q:a 2 -map_metadata 0 output.mp3

Related Operations

Convert AAC to MP3 via API | RenderIO Convert OGG to MP3 via API | RenderIO Convert FLAC to MP3 via API | RenderIO Convert MP3 to WAV via API | RenderIO

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