dB Meter OnlineFree decibel meter

Privacy

Privacy

Short version: your microphone audio never leaves your device, and we don’t collect personal data.

Open the decibel meter

Microphone

The page asks for the microphone only after you tap Start; nothing is requested when the page loads. Sound is analysed in real time inside your browser with the Web Audio API to calculate a level. Audio is never recorded, stored or uploaded, and no audio leaves your device. Tap Stop (or close the tab) and the microphone is released.

Stored on your device only

Two settings are saved in your browser’s localStorage so they are remembered next time:

  • dbmeter.cal — your calibration offset in dB (a number from −30 to +30).
  • dbmeter.resp — your response setting (fast or slow).

Session readings (min, average, max and the 60-second history) live only in the open page and are cleared when you press Reset or close it. Clear the saved settings any time by clearing this site’s data in your browser.

CSV export

Export CSV creates the file in your browser and saves it to your device. It is not sent anywhere.

No accounts, cookies or analytics

There are no accounts or forms, we set no cookies, and the site loads no analytics or advertising scripts.

Hosting

The site is hosted on Vercel, which keeps standard server logs (such as IP address and pages requested) to run and protect the service.

If this changes, we will update this page first. Last updated 20 October 2026.

More from dB Meter Online

Live decibel meterOpen the free online dB meter and measure the room you are in.Decibel chartAbout 30 everyday sounds from 0 to 140 dB, with hearing-risk zones.The decibel scale explainedWhy dB is logarithmic, the +3 / +6 / +10 dB rules, and dB vs dBA vs dBFS.Safe decibel levelsHow long you can be around 85, 94 or 100 dBA — NIOSH and WHO guidance.How loud is 80 dB?Everyday examples, safe listening time and how 80 dB compares with 70 and 90 dB.Measure dB on your phoneiPhone, Android and browser options, accuracy limits and calibration.