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Tool guides

Microphone Recorder Guide

Check a microphone, watch its level and peak, and record a clip to play back or download.

A microphone can be detected by the browser yet still deliver a quiet or silent signal. Mic Tester shows the input level and peak marker, with a recording you can play back to hear what was actually captured. Press Record and the same signal is captured, so the recording can be played back on the page straight away or downloaded as a file.

Check a microphone

Click Start microphone and grant permission when the browser asks. Speak, and the Level bar should move: Level shows the current reading in dBFS and Peak remembers the loudest moment since you started, with a peak near 0 meaning the input clipped. Click Record, speak a sentence, then click Stop recording. The Recording panel appears with a player, the length, the size and the format; Download saves the clip and Discard throws it away.

If the bar barely moves, the wrong input device may be selected or the system gain is low. This tool asks for the raw signal without echo cancellation or automatic gain. Stop microphone releases the device. The clip lives in memory and is never uploaded, so the only way it leaves the browser is your own download.

Where your input goes

Processing runs in your browser. The tool does not upload your input to ilham.dev.

For more background, read Browser Debugging Utilities.

Questions you might have

Where does the recording go?
Nowhere. It is held as a blob in this tab, played through a local object url and dropped when the tab closes. The only way it leaves the browser is if you press Download.
Why does the browser ask for permission?
Reading a microphone requires an explicit grant by design, and it is asked for the first time you press Start microphone. If it was blocked earlier, the padlock in the address bar is where you allow it again.
What format is the clip saved in?
Whatever the browser can encode, which is usually WebM with Opus in Chrome and Firefox and MP4 in Safari. The panel names the format it used, and the download keeps the matching file extension.
Why does the bar barely move when I speak?
Usually the wrong input device is selected, or its gain is low in the system sound settings. Also check that automatic gain control is not fighting the test, and try again closer to the microphone.