Microphone Tester

Does this microphone tester send my audio to any server?

No. The audio stream is processed entirely in your browser using the Web Audio API. Nothing is recorded, uploaded, or transmitted anywhere.

What is the difference between 'Frequency' and 'Waveform' modes?

Frequency mode (Bar Chart) shows the volume of different pitches, from deep bass (left) to high treble (right). Waveform mode (Scope) draws the raw shape of the sound wave in real-time, similar to an oscilloscope.

Why do microphone names show as 'Microphone 1', 'Microphone 2', etc.?

Browsers hide real device names until you grant microphone permission at least once. After permission is allowed, the tool refreshes the list and shows actual device labels.

Why is the visualizer showing a flat line or black screen?

This usually means no audio is being detected. Check if your physical microphone has a mute button enabled, or try increasing the 'Visual Gain' slider if the signal is too quiet.

What does the 'Visual Gain' slider do?

It multiplies the visual height of the graph. Use this to zoom in on quiet sounds. It does not change your actual microphone volume or system input gain.

Why am I getting a 'permission denied' error?

This appears if you block microphone access in the browser popup or site settings. Allow access and refresh the page to fix it.

Does changing the selected input device restart the test?

Yes. Switching microphones requires the browser to release the old hardware stream and request a new one, which restarts the visualizer automatically.

Why does the test stop when I leave or refresh the page?

For security reasons, browsers automatically stop audio tracks when the tab reloads, closes, or becomes inactive. This ensures no audio continues running in the background.