Does the recorder upload my data?

No. The core calculation runs in this browser. Permission-based device streams stay local unless you explicitly download a result.

How accurate is the result?

Accuracy depends on the inputs and hardware. The page labels estimates and calibration limits; use an approved instrument or official source for safety, medical, financial or travel decisions.

Can I use it offline?

Yes. The calculation and UI do not require an external API or account. Browser permissions and device sensors may still be unavailable on some platforms.

Audio Voice Recorder

Record audio privately in your browser

Local voice recorder

Ready to record

Microphone data stays in this tab and is never uploaded.

Why Your Phone's Decibel Meter Is an Estimate, Not a Measurement

How a browser mic turns into an RMS-based sound-level reading, why it can't produce a calibrated dB SPL number, and when that honest gap actually matters.