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MP4 to MP3

Extract the audio track from MP4 to MP3 locally. The video never leaves your device.

Bitrate Higher bitrate = better sound or picture, but a larger file (in kbps).
  • Low (128 kbps)
  • Medium (192 kbps)
  • High (256 kbps)
  • Maximum (320 kbps)
Bitrate mode Constant bitrate (CBR) keeps the rate fixed; variable (VBR) saves space at the same quality.
  • Constant (CBR)
  • Variable (VBR)
Sample rate Samples per second in Hz. Higher = more audio detail; 44100 Hz is CD quality.
  • Original
  • 8000 Hz
  • 11025 Hz
  • 16000 Hz
  • 22050 Hz
  • 32000 Hz
  • 44100 Hz
  • 48000 Hz
  • 96000 Hz
Channels Mono saves space; stereo keeps the left/right separation.
  • Original
  • Mono
  • Stereo

Your files

    Running locally on your device ...

    0%

    Your files never left your device

      Is my file uploaded?

      No. Everything runs in your browser - your file never leaves your device. How this is verifiable

      No upload100% local
      Your content stays with youno third-party access
      Servers in GermanyGDPR by design
      Independently auditedTLS A+ · HTTP headers A+

      Often you only want a videos audio - a talk, an interview, or music as MP3 for your phone. This tool extracts the audio track from an MP4 and saves it as MP3. Bitrate, bitrate mode (CBR/VBR), sample rate and channels (mono/stereo) are freely selectable.

      Conversion runs entirely locally in the browser with ffmpeg.wasm (self-hosted, no third-party CDN). Your video is not uploaded - the decisive difference for private recordings.

      Honestly framed: a new audio track is created, not a magical gain in sound. If the source was already moderately compressed, a higher bitrate adds no extra detail, only a larger output. For spoken content such as a recorded lecture or a conversation, a low level in mono is usually entirely sufficient, whereas for music you would rather pick stereo and ample headroom.

      Specifications

      Specifications
      Input formatsMP4, M4V
      Output formatMP3
      Batch processingNo
      ProcessingLocally in your browser (WebAssembly)
      File uploadNone

      In 3 steps

      1. Drop your MP4 file.
      2. Pick bitrate, mode, sample rate and channels (192 kbps CBR is a good default).
      3. Download the MP3.

      Limitations: In-browser is slower than desktop software; very large/long videos can hit memory limits on mobile. One file per run.

      FAQ

      Is my video uploaded?

      No. The whole conversion happens locally in your browser.

      Why is it slower than an app?

      ffmpeg runs as WebAssembly in the browser here; slower than native code, but without any upload.

      What quality?

      Selectable 128/192/256/320 kbps, CBR or VBR. 320 is near-transparent for music.

      Mono or stereo?

      Channels are selectable: keep the original, downmix to mono (smaller) or force stereo.

      Other audio formats?

      Yes, use the audio converter (MP3/WAV/M4A/FLAC/AAC/OGG).

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