How to use it
- Choose a video file.
- Leave start at 0 and end at the full length to take everything, or type the part you need in seconds.
- Tick Mix down to mono for speech or to halve the size.
- Press Extract audio, listen, and download the WAV.
How it works
The browser’s audio decoder reads the sound track straight from the video file and gives raw samples at 44.1 kHz. The tool keeps the samples between the start and end, averages the channels for mono, and writes them as a 16-bit PCM WAV file. No re-recording is needed, so it is fast.
Worked example
A 2-minute video with stereo sound, start 30, end 90: the WAV holds 60 seconds, 60 × 44,100 = 2,646,000 samples per channel. Its size is 2,646,000 × 2 channels × 2 bytes + 44 = 10,584,044 bytes, shown as 10.09 MB.
Tips
- If the start and end are hard to find, extract everything and cut it in the audio cutter, which shows the waveform.
- Mono is enough for voice recordings, interviews and lectures.
- To remove the sound from a video instead, use mute video.