Free Online Microphone Tester

1. Click Start microphone and accept the browser permission prompt.
2. Speak normally — the volume bar should respond.
3. If the bar stays flat, check the OS input device or browser site settings.
4. Click Stop when finished to release the mic.

There's nothing more frustrating than joining a call and being told you sound silent. This tester requests mic access, creates a MediaStreamSource and pipes it into an AnalyserNode that reads time-domain samples every animation frame. The RMS of the buffer drives a green-to-red volume bar. Nothing is recorded — the analyser runs locally and the stream stops the moment you click Stop or leave the page.

Podcasters check input level before recording. Remote workers test a new headset after a software update. Support reps verify the mic side of a video-call issue without joining an actual call. You'll need to accept the microphone permission prompt your browser shows.

If the bar stays flat, check the OS input device, the site's mic permission and whether another application has the mic open. Different browsers expose different device labels, so seeing your real device name (vs. a generic "Default") is a good signal that permissions are in order.