Reduce background noise and hum in a voice recording
Drop a voice memo or interview. Noise is measured from the quiet parts and turned down. The speech stays.
- Runs on your device
- No sign-up
- Works offline after a visit
How to clean background noise from a voice recording
- Drop the recording on the box.
- Set how much noise to reduce, and tick the rumble, hum or level options you want.
- Compare the before and after waveforms, play the result, then download the WAV.
Questions
How does it find the noise?
It takes the quietest tenth of the recording, frame by frame, and measures the usual level of every frequency in those frames. Anything at or near that level is turned down; speech stands well above it and is left alone.
Which hum does it remove?
It compares the energy at 50 Hz and 60 Hz, with their harmonics, in the quiet parts. It notches the family that is clearly present, and does nothing when neither stands out.
Can it fix a very noisy recording?
It works best on steady noise such as hiss, fans and hum. Strong noise that changes all the time, or a voice buried under noise, cannot be fully separated, so start at a lower strength and raise it slowly.
Is my recording uploaded?
No. The cleaning runs in a background thread in your browser, and nothing is sent anywhere. The result is a 16-bit WAV at the recording’s own sample rate.
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