No server upload
Your MP4 is processed in browser memory.
VoysumPrivate browser tool
MP4 to MP3 Converter
Extract the audio track from an MP4 and download it as MP3—all processing happens on your device.
No uploadNo accountFree to use
✓ Runs locally in your browser
↥Choose or drop a filevideo/mp4, .mp4 · up to 500 MB
🔒 Your media file is never uploaded to Voysum.
Private by default
Useful conversion without giving up your file.
High-quality audio
The MP3 uses a quality-focused variable bitrate setting.
Ready for transcription
Download the audio or continue to Voysum transcription.
Common questions
MP4 to MP3 Converter FAQ
How local browser processing works and what to expect.
Does converting MP4 to MP3 reduce video quality?
The output contains audio only, so the video track is removed.
Is there a file size limit?
The practical limit depends on your device memory. Smaller files work best on mobile devices.
Keep working
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Open tool →Turn your audio into a searchable transcript.
Voysum can transcribe the converted recording and create subtitle files.
Transcribe audio