Remove background noise from video online

Background noise is any sound behind the thing you meant to record. In video it usually comes from the place rather than the person: an air conditioner, a laptop fan, a refrigerator, traffic outside the window, or the faint electrical buzz of a cheap microphone.

These sounds share a useful property: they are fairly constant. A model can learn what a steady hum looks like and what a human voice looks like, and lower the first without touching the second. That is why steady noise is the easiest to remove and a sudden bang is the hardest.

SoundTidy extracts the audio track, converts it to a clean mono signal, and runs it through DeepFilterNet, an open speech-enhancement network built for full-band 48 kHz audio. Long files are cut into overlapping pieces that are cleaned in parallel and joined back together, so the length stays identical and nothing drifts out of sync with the picture.

The cleaned audio is then levelled so it is not quieter than the original, and muxed back with your untouched video stream. You get a file that looks exactly the same and sounds clearer.

The aim is to lower everything that is not speech while leaving the voice as it was recorded. Where the original voice is already clean, the result stays close to the original, and where it is buried in noise the improvement is large.

Because every recording is different, the preview matters. Listen to the first 30 seconds in both versions, and if the voice sounds natural and the noise is gone, process the whole file.

Noise removal works best when the voice is clearly louder than the noise. If you can still understand the speech when you listen to the original, the cleaned version will usually be a clear improvement.

When you can, record closer to the speaker, switch off fans and appliances you do not need, and avoid hard surfaces that add echo. Cleaning is a rescue for footage you already have, not a substitute for a quiet room.