Online Sound Meter
Measure sound levels in your browser - no app required
Online Sound Meter launched on June 13, 2026.
What it does
Online noise level meter - measure decibels from your browser microphone. Free, no download, no account needed. A free browser-based sound meter that helps users measure environmental noise levels in real time using their device microphone.
Online noise level meter - measure decibels from your browser microphone. Free, no download, no account needed.
I tried a bunch of online sound meters and noticed something odd - my readings were always lower than what my phone's built-in meter showed. Turns out, browsers apply three layers of audio processing by default: automatic gain control (compresses loud sounds down), noise suppression (removes what it thinks is background noise), and echo cancellation. These are great for voice calls. They're terrible for measurement. With AGC on, a 75 dB room and a 55 dB room can show nearly identical readings because the browser is normalizing everything toward "comfortable speech level." You're not measuring the room anymore - you're measuring the browser's opinion of what the room should sound like. This…from onlinesoundmeter.com
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