Visualize your microphone in your browser
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HTML5 Mic Visualizer

This page uses the HTML5 AudioContext.createAnalyser() API to visualize the input audio of your device microphone.

A demo page can be found here. It works in modern versions of desktop browsers, as well as in iOS and Android.

Note: The dB value on the page varies from your device microphone, and should not be considered as an accurate representation of your environment sound pressure.