Check that your microphone works with a live level meter in dBFS, waveform, noise floor and clipping alerts, then record a short clip to hear yourself.
Two minutes before a call is the worst time to discover the wrong microphone is selected. Start this Mic Test, say a few words, and a meter shows whether sound is reaching the browser, how loud it is in dBFS, and whether it is distorting.
Under the meter you get a live waveform or spectrum, the background noise level, a count of clipping events and the settings the browser applied. A 5-second recording lets you hear what other people will hear.
The three boxes for Echo cancellation, Noise suppression and Auto gain restart the microphone with the browser’s call filters on or off. Turn them all off to hear the raw signal a recording app would get, then compare the noise floor.
dBFS is decibels relative to digital full scale, so 0 is the loudest value the signal can carry and everything else is negative. The meter spans −60 to 0 dBFS with a peak-hold line that lingers for 1.5 seconds. Normal speech should peak somewhere between −20 and −6 dBFS. These are digital levels after your system’s input gain, not sound pressure in the room, so two microphones in the same spot can read very differently.
The noise floor is the quietest quarter-second of the last 10 seconds, which approximates the room and electrical hiss between words. With auto gain on, the browser may raise it during silence.
These are the browser's own call-style filters. Turn all three off to hear the raw microphone, the way a recording app would.
Press Start Test and allow microphone access. The sound is analysed in this tab and never recorded or sent anywhere unless you press Record.