Extract Pure Audio
From Your Videos Instantly
Convert high-resolution MP4 files directly inside your browser to pristine, standard MP3 audio. Zero server uploads, zero subscription fees, maximum performance.
Drag & Drop your MP4 here
or click to browse local folders
No files leave your device
video_sample.mp4
14.2 MB
Extracting audio track...
0%
Extraction (WAV)
Pending
MP3 Encoding
Pending
Studio Settings
320 kbps
Higher bitrates deliver premium dynamic range, perfect for high-fidelity headphones and surround systems.
Off
s
s
Duration will be automatically calculated when file is loaded.
How Local Conversion Works
- Your computer loads the MP4 container locally via File API.
- The Web Audio API decodes the audio streams into high-fidelity float arrays.
- The background Web Worker Thread converts raw float arrays into standardized 16-bit PCM buffer blocks.
- An optimized lame.js instance bundles MP3 frames in parallel.
- Your browser packages everything into an offline MP3 Blob download.