MP4 to FLAC Converter (Free, Online, No Upload)

Extract lossless FLAC audio from any MP4 video right in your browser. Nothing gets uploaded to a server. FLAC preserves every detail of the original audio without compression artifacts, making it ideal for archival or professional audio work. The conversion runs locally on your device.

Try it in your browser

Loading FFmpeg engine... (~31 MB)

Use the API

curl -X POST https://renderio.dev/api/v1/run-ffmpeg-command \
  -H "X-API-KEY: ffsk_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
  "ffmpeg_command": "-i {in_video} -vn -c:a flac {out_audio}",
  "input_files": {
    "in_video": "https://example.com/input.mp4"
  },
  "output_files": {
    "out_audio": "output.flac"
  }
}'

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

Common Variations

Maximum compression level

-i input.mp4 -vn -c:a flac -compression_level 12 output.flac

24-bit output

-i input.mp4 -vn -c:a flac -sample_fmt s32 output.flac

Specific sample rate

-i input.mp4 -vn -c:a flac -ar 48000 output.flac

Related Operations

Free FLAC to MP3 Converter Online | RenderIO Free MP4 to WAV Converter Online | RenderIO MP4 to MP3 Converter Online Free, No Upload | RenderIO Extract Audio from Video Online Free - No Upload | RenderIO

Need to process at scale?

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

Get your API key