MP4 to MP3

Pull the audio track out of an MP4 and save it as a high-quality VBR MP3 (around 190 kbps, ffmpeg quality 2). The video stream is discarded — this is the right tool when you want a podcast, lecture, music clip, or voice memo extracted from a video file. The conversion runs locally via ffmpeg.wasm, so your file never leaves your device. Performance depends on your CPU: extracting audio is typically faster than re-encoding video, but very long or 4K sources may still be slow. For best results keep inputs under about 500 MB.