Reduce steady background noise — hiss, hum, fan or air-conditioner — from a recording with this free online noise reducer. Upload a clip, set the strength, preview, and download a cleaner MP3 or WAV. Everything runs in your browser, with nothing uploaded and no signup.
Noise Reducer
Reduce steady background noise — hiss, hum, fan or air-conditioner — from a recording. Upload a clip, set the strength, preview, and download a cleaner MP3 or WAV. Everything runs in your browser; nothing is uploaded.
This uses spectral subtraction: it learns the noise from the quietest moment of your clip, then subtracts that noise fingerprint across the whole recording — so it reduces steady hiss and hum even while someone is talking. For the best result, make sure your recording has a short moment of near-silence (room tone) somewhere, and don’t push the strength so high that it sounds watery. It works well on constant background noise; it can’t remove sudden sounds like a door slam or a barking dog. Everything is processed on your device — nothing is uploaded.
How to remove background noise
- Upload your recording. Drag an MP3, WAV, M4A, OGG or FLAC onto the box (up to ~50 MB). It’s processed on your device.
- Choose a strength. Start with Medium; go stronger for heavier noise, lighter if it starts to sound watery.
- Preview to compare — the goal is quieter background with the voice still natural.
- Download a cleaner MP3 or WAV.
How it works
The tool uses spectral subtraction: it finds the quietest moment in your clip, measures the “fingerprint” of the noise there, and then subtracts that fingerprint across the whole recording. Because it removes the noise’s frequencies rather than just muting quiet parts, it can reduce steady hiss and hum even while someone is talking — not only in the gaps.
For the best result, make sure your recording contains a short moment of near-silence (a second of room tone) so the tool can learn the noise accurately, and don’t push the strength so high that the voice starts to sound hollow or watery. It works well on constant background noise; it can’t remove sudden, one-off sounds like a door slam or a dog bark. It isn’t an AI de-noiser, so results vary with the recording — but on hiss, hum and fan noise it makes a real difference.
What you can use it for
- Voice recordings & podcasts — clean up room hiss and computer-fan hum.
- Interviews & lectures — reduce air-conditioning and background rumble.
- Voice memos — make a rushed recording clearer.
- Samples — tidy up a noisy field or phone recording.
Free, private, and fully in your browser
All analysis and processing happen locally with the Web Audio API — your recording never leaves your browser, there is no signup, and there is no watermark. Pair it with the Silence Remover to cut dead air, the Volume Booster to even out the level, or the Online Equalizer to shape the tone.
Frequently asked questions
How do I remove background noise from audio for free?
Upload your clip here, pick a strength, preview, and download the cleaned MP3 or WAV. It runs in your browser with no signup and nothing uploaded.
What kind of noise can it remove?
Steady, constant background noise — hiss, hum, fan, air-conditioner, electrical buzz. It can’t remove sudden one-off sounds like a slam, cough or bark.
Why does it need a quiet moment in the recording?
It learns the noise from the quietest part of your clip. A second of “room tone” (near-silence) lets it measure the noise accurately, so it removes the right thing. Most recordings have a quiet moment at the start or in a pause.
It sounds watery or hollow — what do I do?
Lower the strength. Aggressive settings can add a “musical” artefact. Use the lightest strength that still gives you a clean-enough background.
Is this AI noise removal?
No — it uses fast, private spectral subtraction rather than an AI model. It’s excellent on steady noise; AI de-noisers can do more with complex noise, but this needs no upload and works instantly.
Does it upload my recording?
No. Everything runs in your browser using the Web Audio API; your file never leaves your device.
Is it really free?
Completely — no signup, no watermark, no limits.