Remove hum, hiss and fan noise from audio — free
Quick answer Reduce steady background noise — AC hum, fan whirr, tape-style hiss — from a voice recording. Upload, set a strength, download.
Reduce steady noise (fan, AC, hiss), or run Studio mode for real AI speech enhancement. 15MB max (Pro: 20MB).
Free to try · No signup required · Commercial use allowed · How we test · About VoxCraft
Remove hum, hiss and fan noise from audio online for free with VoxCraft. Upload a recording, set the strength, and download a quieter version — no install and no signup on the free tier.
These three problems have one thing in common: the noise is steady. A fan, an air-conditioner, a refrigerator, electrical hum or a cheap microphone's hiss all produce a constant sound under the voice. Spectral noise reduction is built for exactly that, because it can learn what the constant part sounds like and turn it down.
It is much less effective on sudden sounds — a door slam, a cough, a passing motorbike — and on other people talking, because those aren't steady. For messy real-world speech, Pro adds an AI Studio mode. See the main background noise remover for the full explanation.
Start gently. Too much reduction makes voices thin or watery; a moderate setting that makes the hum sit well below the voice usually sounds best.
How it works
- Upload your recording (15MB max, 20MB with Pro).
- Choose Standard (free) and set the strength — start around the middle.
- Tap Remove noise and listen to the result.
- If the noise is still obvious, increase the strength a little; if the voice sounds thin, back off. Then download.
Who uses this
Fan or AC in the room
Quieten a constant whirr behind a voice memo or video voice-over.
Mic hiss
Reduce the hiss from a budget microphone or a quiet recording boosted in volume.
Electrical hum
Tone down mains hum picked up by a cable or a laptop.
Tips for better results
- It works best when there's a stretch of steady noise to learn from.
- Reduce noise before you boost volume; boosting first makes noise louder too.
- Record in a quieter spot or move away from the fan next time — prevention beats repair.
- Pair it with Normalize afterwards to bring the level back up.
Frequently asked questions
Can it remove hum completely?
It can reduce it a lot, but heavy settings affect the voice. Aim for much quieter, not silent.
Does it work on hiss?
Yes. Constant hiss is one of the easiest things for spectral noise reduction to lower.
What about wind or sudden noises?
Those aren't steady, so Standard mode handles them poorly.
Is it free?
Standard mode is free within free-tier limits with no account required; Studio AI mode is Pro.
What formats work?
Common formats such as MP3, WAV, M4A. Free uploads up to 15MB; Pro 20MB. Output is mono.
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