Microphone Level Test
Check your microphone’s digital input level in dBFS. This test does not directly measure a browser tab or sound pressure in your room.
Ready. Microphone is off.
Access is requested only when you start. The test processes microphone samples locally, makes no recording and uploads no audio. Stop releases this page’s microphone stream.
What does dBFS mean?
dBFS is referenced to digital full scale. The test calculates the RMS level of a short block of microphone samples. A reading closer to 0 means a higher digital input level. The bar displays −60 to 0 dBFS; quieter signals can fall below that scale.
Microphone sensitivity, input gain, distance and device processing affect the reading. Without acoustic calibration, it cannot be converted to dB SPL. It does not assess a safe listening level or perceived loudness. Doubling digital amplitude adds about 6 dB; that does not automatically double perceived loudness.
For the loudness of a recording, read our guide to LUFS.
Make a repeatable comparison
- Start the test and allow your chosen microphone. Speak to check that it receives a signal.
- For a speaker comparison, use a comfortable level and replay the same short passage. Keep microphone position, input gain and output device fixed.
- Change one setting at a time. Note the approximate range of readings, rather than a single moving value.
- Stop the microphone when finished. Laptop microphones cannot meaningfully compare headphone output this way.
The test requests that automatic gain control, echo cancellation and noise suppression be disabled. Your browser or device may still apply processing. Differences are observations of this setup, not verified measurements of an extension’s gain.
Is your browser too quiet?
Start with the player, output device and system mixer: laptop checklist, Edge guide.
Calculation and API: W3C Web Audio — getFloatTimeDomainData. Method reviewed October 4, 2026.