Convert Mono to Stereo Audio via API

Convert mono recordings to stereo for music production, broadcast requirements, or platform compatibility. Duplicate the mono channel to both left and right outputs.

Try it in your browser

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} -ac 2 {out_audio}",
  "input_files": {
    "in_audio": "https://example.com/input.mp3"
  },
  "output_files": {
    "out_audio": "output.mp3"
  }
}'

Need an API key? Get your free API key to start processing files programmatically.

Common Variations

WAV output for editing

-i input.wav -ac 2 output.wav

With slight stereo widening

-i input.mp3 -af "aecho=0.8:0.88:6:0.4" -ac 2 output.mp3

AAC stereo output

-i input.mp3 -ac 2 -c:a aac -b:a 192k output.m4a

Related Operations

Convert Stereo to Mono Audio via API | RenderIO Normalize Video Audio via API | RenderIO Convert WAV to MP3 via API | RenderIO Convert MP3 to WAV via API | RenderIO

Need to process at scale?

Automate this with the RenderIO FFmpeg API. Process thousands of files programmatically or through no-code video automation.

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