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Microphone Test

Start the mic to see input level (dBFS), waveform and spectrum. Clipping, noise and mute are detected automatically, and a guided speak test rates whether your mic is good enough for meetings. Nothing is uploaded.

On-device・No upload

Your files and input are processed only inside your browser on this device and are never uploaded to our servers.

Click “Start microphone” and your browser will ask for permission. Choose “Allow” and the level meter and waveform come alive. Audio is analysed on your device only — never uploaded.

Browser audio processing

Changing these re-opens the microphone. Most video-call apps keep all three on.

Speak test (about 8 s)

Stay quiet for the first 3 seconds so background noise can be measured, then speak at your normal meeting volume for 5 seconds. Level, clipping, noise and signal-to-noise ratio are rated.

Start the microphone first.
Test recordingUp to 30 s

Record up to 30 seconds and play it back to hear how you sound.

The recording exists only in this tab’s memory and is discarded when you leave the page.

Audio is analysed on your device and never uploaded. Test recordings stay only in this tab’s memory.

How to use

  1. Click “Start microphone” and choose “Allow” in your browser’s prompt.

  2. Speak and watch the level meter and waveform. The diagnostics panel shows whether audio arrives and whether there is clipping or noise.

  3. Click “Start test”: stay quiet for 3 seconds, then speak normally for 5 — you get pass/check/fail ratings for level, clipping, noise and SNR.

  4. Optionally record up to 30 seconds with “Test recording” and play it back.

  5. If you have several microphones, switch under “Microphone” and compare echo cancellation, noise suppression and auto gain on and off.

What it does

Accurate dBFS level meter

Shows RMS, peak and peak hold in dBFS and flags clipping (hitting digital full scale) with a lamp and a counter — adjust your gain by numbers, not by guesswork.

Meeting-ready pass/fail check

The speak test measures the noise floor while you are quiet and your speech level while talking, then rates them against clear targets (speech −30 to −9 dBFS, noise ≤ −60 dBFS, SNR ≥ 25 dB) with fix-it advice.

Mute and dead-silence detection

A perfectly zero signal usually means a hardware mute switch or OS input setting, so it is reported separately from a merely quiet mic.

Compare browser audio processing

Toggle echo cancellation, noise suppression and auto gain individually; the settings the browser actually applied, sample rate, channels and latency are shown.

30-second test recording

Recordings stay in the tab’s memory for playback and are saved as a file only if you ask. They are discarded when you leave.

Use cases

  • Make sure your mic picks up your voice before a Zoom, Teams or Google Meet call
  • Find out with numbers why people say you are too quiet or distorted
  • Compare background noise between a new headset and a USB mic
  • Check whether the mic is muted and which device is actually used
  • Hear how noise suppression changes your voice by recording both ways

Capability matrix

FeatureSupportNotes
RMS/peak level in dBFS with clipping detectionSupported—
Waveform and frequency spectrumSupported—
Guided speak test (noise, SNR, level ratings)Supported—
Test recording (up to 30 s), playback and saveSupportedWebM, MP4 or Ogg depending on the browser
Toggle echo cancellation and other processingPartialSome browsers/OSes ignore the request (the applied value is shown)
Latency and channel countPartialSafari and Firefox expose fewer values
Sound pressure (dB SPL) measurementNot supportedMic sensitivity varies by model, so absolute loudness cannot be measured
Left/right speaker or earphone checkNot supportedUse the speaker test instead

Limits & notes

  • Microphone permission is per browser and per site. Once denied, re-allow it in the browser settings.
  • dBFS is the digital signal level, not real-world loudness (dB SPL).
  • With auto gain control on, the browser changes the gain over time, so readings drift.
  • Test recordings are limited to 30 seconds, kept in memory only and discarded when you leave.
  • In-app browsers (e.g. in social apps) may block microphone access.

Privacy & safety

Audio is analysed in your browser and never sent to a server. Test recordings are kept only in the tab’s memory; a file is saved to your device only when you click “Save recording”.

FAQ

What microphone level is right?
Aim for roughly −30 to −9 dBFS on the louder parts of your speech. Above −6 dBFS peaks may clip; below −40 dBFS others will hear you quietly. The speak test checks this for you.
The meter does not move at all
Check the mute switch on your headset or mic, the selected OS input device and its volume. A perfectly zero signal is reported as digital silence. On Windows, also check Settings → Privacy & security → Microphone for desktop apps.
What is dBFS?
Decibels relative to digital full scale: 0 is the maximum, so values are always 0 or below. Reaching 0 dBFS cuts off the waveform and causes distortion. It is not the same as a sound level meter’s dB.
Should noise suppression be on or off?
On helps intelligibility in noisy rooms but can make music or instruments sound unnatural. Record with it on and off here and compare.
Is my recording uploaded?
No. It exists only in this tab’s memory and is gone when you close the page. Click “Save recording” only if you want a file.

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