How to use
- Click Start microphone and allow access when the browser asks.
- Speak normally and watch the level meter move.
- Click Record 5 seconds, then play the clip back to hear how you sound.
- Pick another microphone from the list if you have several.
Options explained
- Level meter
- Shows the input level in decibels relative to full scale. Normal speech sits around −30 to −12 dB; red near 0 dB means the input is too loud and may distort.
- Raw input
- Echo cancellation, noise suppression and automatic gain are switched off so you see what the microphone really picks up.
How the level meter is calculated
The meter takes a short block of audio samples, each between −1 and 1, and computes the root mean square (RMS). The decibel value is 20 × log10(RMS), so full scale is 0 dB and silence is shown as −∞ dB. The bar maps −60 dB to 0 dB onto 0–100%.
| RMS of the signal | Level | Bar |
|---|---|---|
| 0.5 | −6.0 dB | 90% |
| 0.1 | −20.0 dB | 67% |
| 0.01 | −40.0 dB | 33% |
| 0.001 | −60.0 dB | 0% |
Every halving of the RMS lowers the reading by about 6 dB, so the 0 dB end of the bar is reached only by a signal at full scale, which is where clipping begins.
Frequently asked questions
The meter does not move. What is wrong?
Check that the right microphone is selected, that it is not muted with a hardware switch, and that your system input volume is not at zero.
Why does my voice sound different in calls?
Call apps apply noise suppression and automatic gain. This test plays the raw signal so you can judge the microphone itself.
Is my recording uploaded?
No. The clip exists only in this page and disappears when you leave it.
Privacy
This tool runs entirely in your browser. Your files and text are processed on your device and are never uploaded to our servers.