Audio Enhancer

How to remove background noise from audio

Three steps, in your browser.

1. 1

   Drop the recording

   MP3, M4A from a phone, WAV, FLAC and other common formats, up to 30 minutes. The page reads it and shows its length and how loud the quiet parts are: the background level.

2. 2

   Enhance, then set the strength

   Press Enhance and the noise model runs through the recording, a few seconds per minute of audio. Then switch between Original and Enhanced while it plays and move the strength slider until the voice sounds natural.

3. 3

   Download

   Save the result as an MP3 or a 16-bit WAV. Normalize is on by default, so the cleaned file also comes out at a sensible level; turn it off to keep the original volume.

What the audio enhancer does, and what it does not

• Steady noise under speech

  The model was trained to separate a voice from the noise around it: air conditioning, a fan, a running engine, traffic, electrical hum, the hiss of a cheap microphone. That is where it does its best work.

• Strength is a mix, not a switch

  At 100% you hear the model's full output. At 60% you hear 60% cleaned and 40% original, which keeps a little room tone and often sounds more natural on a quiet recording. Change it as often as you like; nothing is recomputed.

• Normalize, if you want it

  After the noise is gone the recording often sounds quieter than it is. Normalize lifts it so the loudest peak sits at -1 dB, the same rule the Volume Booster uses. It is one fixed gain: nothing is compressed.

• What it cannot fix

  Echo from a bare room, two people talking over each other, a voice that clipped when it was recorded, wind hitting the microphone, music you want to keep. Those are not steady noise, and the model will either leave them or damage the voice trying.

Recordings that usually need it

• A site visit or plant tour

  Machines, ventilation and traffic sit under everything the customer said. Run the enhancer at full strength first; if the voice sounds thin, back off to 70 or 80%.

• Notes dictated in the car

  Road and engine noise is as steady as it gets, so the model handles it well. Normalize afterwards: dictation in a car is usually quiet.

• An interview in a café

  The espresso machine and the ventilation come out; the people at the next table mostly do not, because they are speech too. Expect an improvement, not silence.

• A meeting recorded with the phone on the table

  Projector fans and air conditioning go, and the far voices get clearer once the hiss under them is gone. If the far voices are still too quiet, run the result through the Volume Booster.

How the noise removal works