Updated October 2026 · Voice recording and noise removal
Watery or robotic sound is usually over-processing: too much reduction, too high sensitivity, or stacking several denoisers. Lower the reduction to 6–12 dB, lower sensitivity, apply noise removal once, and fix the noise at the source so less removal is needed.
Noise reduction works by estimating the noise at each frequency and turning those frequencies down. Voice and noise share the same frequencies, so every cut also takes away a little voice. If the cut is too deep, or the noise estimate is too high, parts of your voice vanish and leave a thin, bubbly, “underwater” character. When the gain changes rapidly from moment to moment the ear hears “musical noise”, small chirpy artifacts.
| You hear | Cause | Fix |
|---|---|---|
| Thin, hollow voice | Reduction too deep | Lower reduction to 6–12 dB |
| Bubbly or chirpy background | Sensitivity too high or noise estimate too aggressive | Lower sensitivity; learn noise from a clean sample |
| Words start or end oddly | Gate or reduction reacts too fast | Reduce the gate; slow the response |
| Robotic sound after several tools | Stacked denoisers | Use one denoiser, once |
| Worse on MP3 files | Compression artifacts already present | Start from the original WAV when possible |
A useful rule is to remove only as much noise as you need to stop noticing it. For light hiss, 6–12 dB is usually enough. For a loud fan, 15–20 dB may be needed. If you reach for 30 dB, the real fix is a quieter recording. In the free noise-cancelling recorder, tick Hear original and compare while you adjust.
If you need to push the settings to the maximum, the recording itself is the problem. A closer mic, a softer room and noise sources switched off will always sound better than heavy processing. For the full process, read how to record a voice-over without background noise.
Record voice-overs with live noise removal, or clean an existing file. Runs in your browser, nothing is uploaded.
The reduction is too strong or the noise estimate is too high, so parts of the voice are removed with the noise. Lower the reduction and sensitivity.
Use the least that makes the noise unnoticeable, often 6–12 dB for hiss and up to about 15–20 dB for a loud steady fan.
Not really. Go back to the original recording and apply gentler settings once.
