Audio Noise Reducer
Clean up voice notes, interviews, lectures and phone videos by turning down steady background noise such as hiss, fans and electrical hum. Files stay on your device.
How to remove background noise from audio
- Choose an audio or video file.
- Check the noise sample (the quietest part is picked for you), then set the strength and filters.
- Press Reduce noise, compare Before and After, and save the result.
Features
- Automatic noise sample from the quietest part
- Pick the noise sample on a waveform
- Strength slider
- 50 Hz and 60 Hz hum filter
- Low-cut filter for rumble
- Before/after comparison
- Save WAV, MP3 or the video with clean sound
Frequently asked questions
What is the noise sample?
A short part of the recording with only background noise, such as the pause before someone speaks. The tool learns the noise from it and turns down sound that matches it everywhere. The quietest half-second is picked automatically; drag across the waveform to choose a better part.
What kind of noise can it remove?
Steady noise works best: hiss, air conditioners, fans, computer hum, traffic rumble and the 50 Hz buzz from wiring. Sudden sounds such as a dog barking, horns or other voices can’t be separated this way.
Which hum filter should I use?
Use 50 Hz in India, Europe, most of Asia and Africa, and 60 Hz in the USA, Canada and parts of South America. Leave it off if you don’t hear a low buzz.
Can it clean the sound of a video?
Yes. Choose an MP4 or WebM video. After cleaning, Save video puts the cleaned sound back into the video; the picture is copied without re-encoding.
Is there a length limit?
Files up to 10 minutes. Longer recordings need a lot of memory in a browser, so cut them into parts first with the Audio Trimmer or Video Trimmer.
Related tools
All Audio & Video →- Volume Booster Fix a recording that is too quiet.
- Audio Trimmer & Ringtone Maker Select the part of a song or recording you want on the waveform, preview it and save it, for example as a phone ringtone.
- Voice Recorder Record voice notes, interviews, practice sessions or voice-overs in your browser and download them as MP3.
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- Online Video Player Watch videos from your phone or computer, or from a link, with a choice of audio language and subtitles.