Audio Noise Reducer – Remove Background Hiss Online (Free)
Free online audio noise reducer powered by FFmpeg's afftdn FFT-based denoiser. Removes background hiss, hum, fan noise from recordings. Adjustable strength + optional high-pass filter. Runs locally.
Example Output
Voice clarity improves while steady background noise drops noticeably. Medium setting handles most podcast / Zoom recordings.
interview-denoised.wav (background noise lowered ~20 dB, voice intact)
What is Audio Noise Reducer?
Clean up noisy recordings — fan hum, AC drone, room tone, microphone hiss — without sending audio to a paid SaaS. The tool uses FFmpeg's afftdn filter, an FFT-based spectral denoiser that learns the noise profile from quiet regions and subtracts it from the whole signal. Three strength presets cover most real-world recordings.
Why use this tool?
- Touch-friendly UI, fine on phones for on-the-go edits
- No registration, account, or installation required
- No API keys to manage and no rate limits to monitor
How to use
- Upload an audio file
- Pick strength (start with Medium — 20 dB)
- Optional: enable 80 Hz high-pass to cut rumble
- Click Reduce Noise and listen to compare
Examples
Home-office podcast cleanup
A WFH podcast recording has an audible AC fan. Medium denoise + 80 Hz high-pass gives a noticeably cleaner episode.
Zoom interview
A recorded Zoom call has compression artifacts and steady codec noise. Light denoise smooths them out without losing voice character.
Old cassette transfer
A digitised cassette tape full of hiss cleans up dramatically with Strong denoise — some music sparkle is lost but speech becomes intelligible.
Common use cases
- Podcast / Zoom recording cleanup
- Audiobook narration polish
- Old tape / vinyl digitisation
- Field recording denoising
- Voice-over track prep
Troubleshooting
- Voice sounds "underwater" after denoise
- Reduce strength to Light. Aggressive denoise introduces frequency-domain artifacts; the trade-off between noise removal and naturalness is unavoidable.
- Noise is still audible
- Bump to Strong (30 dB) and enable high-pass. For very harsh noise (chair squeak, door slam), denoise alone won't cut it — those are transient, not stationary.
- High-pass removes too much bass
- 80 Hz is a typical voice / podcast setting. Unfortunately the tool currently only offers the 80 Hz preset; for music with bass, leave high-pass off.
Frequently Asked Questions
Steady background noise: fan hum, room tone, hiss, AC noise, low rumble. The afftdn FFT denoiser learns the noise floor from quieter regions and subtracts it.
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