Audio Noise Reducer
Clean up recordings spoiled by background noise. Reduce constant hiss and fan noise, remove low rumble and electrical hum, and keep voices clear, with a strength control so the result still sounds natural.
- Files stay on your device
- No sign-up
- Free to use
Noise reduction
Extra filters
Output
Processing happens on your device; your audio is not uploaded.
How to use Audio Noise Reducer
- Drop a recording onto the upload area; the audio track of videos works too.
- Choose Steady noise for hiss, hum and fans, or Broadband noise in speech for a gentler method.
- Set the strength and choose extra filters for rumble, harsh highs and mains hum.
- Select Reduce noise, compare with the original and download.
Audio Noise Reducer features
Spectral noise reduction
Learns the steady background noise and subtracts it across the frequency range.
Speech-friendly mode
Non-local means denoising preserves voice detail for broadband noise.
Rumble filter
Removes low-frequency rumble from wind, traffic and handling noise.
Hum removal
Notches out 50 and 60 Hz mains hum and their first harmonics.
Strength control
From gentle cleaning to strong reduction.
Private
Your recordings are processed on your device.
When to use Audio Noise Reducer
- Cleaning up podcast and interview recordings made at home.
- Removing fan or air-conditioning noise from video voice-overs.
- Reducing hiss in old cassette transfers.
- Removing hum caused by ground loops in guitar and microphone recordings.
- Making lecture and meeting recordings easier to understand.
Audio Noise Reducer FAQ
Can it remove music or voices in the background?
No. Noise reduction removes steady, noise-like sounds. Changing sounds such as music, traffic or other people speaking are too similar to the wanted audio to separate this way.
What strength should I use?
Start around 10–12 dB. Higher values remove more noise but can make voices sound watery or metallic. Listen to the result and lower the strength if it sounds processed.
Should hum removal be on?
Only if you hear a low, steady buzz. Mains electricity is 50 Hz in Europe, Asia, Africa and Australia, and 60 Hz in the Americas; the filter targets both.
Does it work on video files?
Yes. The audio track is cleaned and saved as an audio file. Add it back to the video in an editor.
How can I get better recordings in the first place?
Record close to the microphone in a quiet, soft-furnished room, turn off fans, and set levels so speech is well above the noise. Prevention beats any noise reduction.
How noise reduction works and where it stops
Steady background noise, such as hiss, fans and room tone, has a consistent spectrum: roughly the same energy at each frequency over time. Spectral noise reduction estimates that noise profile and, in each short slice of audio, lowers frequencies that contain little more than the noise. Speech, which rises well above the noise floor in its own frequencies, passes through largely unchanged.
The trade-off is artefacts. Reducing noise too aggressively removes parts of the wanted signal and leaves a fluttering, “underwater” quality sometimes called musical noise. That is why the strength is adjustable; moderate settings give the most natural results.
Some noise is easier to remove with simple filters. Rumble from wind, footsteps and handling sits below the voice range and is removed cleanly by a high-pass filter. Mains hum is a pure tone at 50 or 60 Hz with harmonics, so very narrow notch filters can remove it without touching the rest of the audio.
Noise reduction cannot separate sounds that overlap the voice in time and frequency, such as other people talking or music. For those, recording in a quieter place remains the only reliable solution.