Remove hum, hiss and buzz from recordings
A steady hum, a hiss under every pause, a buzz that never stops: they come from cables, chargers and microphones turned up too high. Upload the recording and the AI keeps the speech and removes the rest.
No sign-up for 3 files (6 min) · deleted after 7 days · never used for training
Drop a humming or hissy recording here
Audio files, up to 3 minutes
AAC · FLAC · M4A · MP3 · OGG · OPUS · WAV
Free: 3 files up to 3 minutes each (6 minutes in total), no account.
Before and after
The pauses are silent and only the voice remains.
How to remove hum and hiss
- Step 1
Upload the recording
The audio file as it came off the recorder or the computer (video files need Premium).
- Step 2
Let the AI keep the voice
It removes steady hum, hiss and buzz, and any other noise or echo, in one pass.
- Step 3
Compare and download
Listen against the original while it plays, then download MP3 or WAV.
Hum, hiss and buzz: what they are
- Hum is a low, steady tone, often from a ground loop, a laptop on its charger or an unshielded cable near a power lead.
- Hiss is the soft 'shhh' under everything, usually from a microphone preamp turned up high or an inexpensive USB microphone.
- Buzz is a harsher, rough version of hum, common with guitar amps, dimmer switches and cheap adapters.
Why a notch filter is not enough
Electrical hum is not one tone but a stack of them, and a notch filter at the base frequency leaves the rest. Cutting all of them takes chunks out of the voice, which lives in the same range. The model instead keeps the voice and removes what is not voice, so the speech keeps its body.
Fix it at the source next time
- Unplug the laptop charger while recording, or plug everything into the same power strip.
- Keep audio cables away from power leads.
- Turn the microphone gain down and speak closer instead.
Questions about hum and hiss
What causes hum in a recording?
Usually electrical interference: a ground loop, a laptop on charge, or an unshielded cable. It shows up as a steady low tone.
What causes hiss?
Mostly a microphone preamp turned up high or an inexpensive USB microphone. It is the steady 'shhh' under the voice.
Will it work on old recordings?
It is built for speech and reduces steady hiss and hum well. Recordings with heavy damage, such as clicks or dropouts, may keep some of it.
Is it free?
Yes. Without an account you get 3 files up to 3 minutes each, 6 minutes in total, with no sign-up. A free account raises that to 30 minutes per file and 60 minutes of audio per day, still with no card. Premium allows up to 5 hours per file, 10 hours of audio per day, and fair use of 100 hours per 30 days.
Which files can I upload, and what do I get back?
On every plan: audio files (WAV, MP3, M4A, AAC, FLAC, OGG and Opus). Video files (MP4, MOV, WebM, MKV, AVI and WMV) need Premium; the sound is taken from the video and you download the cleaned audio. Results download as MP3 or WAV.
What happens to my recording?
It is used only to make your result. It is never used to train models, and both the upload and the result are deleted automatically after 7 days.