How to remove background noise from audio
- Drop a noisy recording into the upload panel — voice memos, podcast takes, interviews or music all work.
- Set the reduction strength slider: the default is a good starting point for typical mic hiss and room noise.
- Press apply and let the spectral processor learn the noise floor and subtract it.
- A/B the Before and After players, adjust the strength if needed, then download the clean file.
This background noise remover rescues recordings you thought were ruined: laptop-fan drone under a voiceover, hiss on an old cassette transfer, wind on a phone clip, fridge hum behind a podcast interview. The spectral engine profiles the steady noise in your file and subtracts it frame by frame, keeping the voice on top crisp — and because everything runs in your browser, sensitive recordings like meetings or voice notes never leave your device. Free, no signup, no file limits. For best results, record a second of silence at the start of your takes so the noise floor is easy to learn.
FAQ
How does the background noise remover work?
It uses spectral noise reduction: the tool learns the constant noise floor of your recording — the hiss, hum or rumble that never stops — and subtracts that fingerprint from the whole file while leaving speech and music intact. All of it runs locally in your browser.
What kinds of noise can it clean up?
It is strongest on steady, constant noise: microphone hiss, electrical hum, fan and air-conditioner drone, wind rumble and room tone. One-off sounds like a door slam or a cough are not constant, so they are largely left alone.
What does the reduction strength slider change?
It scales how much of the learned noise fingerprint is subtracted. Low values clean gently and keep the recording natural; very high values remove more noise but can add a watery, underwater artifact to quiet passages. Start around the default and increase until the noise is gone.
Is it free, and do my recordings get uploaded?
Yes, it is free with no account, and nothing is uploaded — the spectral processing happens on your device. Compare before and after in the built-in players, then download the cleaned file as MP3 or WAV.