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Real Before/After Measurement

Active Noise Suppression Stress Test

Plays a synthesized noise profile through your speakers, then measures how much your browser's real noiseSuppression toggle actually reduces it in what your microphone captures. A genuine before/after comparison using a standard, browser-exposed constraint — not a demo.

Status

Pick a noise profile above, then click Run Test. Stay quiet while it plays — this measures the noise floor, not your voice.

Result

Suppression Effect

  • Suppression OFF:—
  • Suppression ON:—
—
Reduction

Verdict: —

How to Interpret Your Results

What your reduction number actually means

The number that matters is Reduction, in decibels (dB). It is the difference between how much of your synthesized noise profile survived into your captured mic signal with suppression off versus with it on — a direct before/after comparison of your browser's real noiseSuppression constraint, not a simulated or estimated figure.

Over 12dBStrong, clearly audible suppression. Your browser and microphone combination is doing real, effective work on this noise type.
5–12dBModerate suppression. Noticeable and worthwhile, but a listener would still perceive some of the original noise underneath your voice.
1–5dBWeak suppression. Barely distinguishable from no suppression at all for this specific noise type.
Under 1dBNo measurable effect. Either your browser's suppression is off, unsupported for this device, or your hardware is already handling noise removal upstream of anything the browser can measure.

Run the test with more than one noise profile above — typing, fan hum, and background chatter sit in different frequency ranges, and suppression algorithms are rarely equally effective across all three. A strong result on chatter does not guarantee a strong result on typing.

Benchmark Reference

Reduction Bands at a Glance

GradeReductionWhat it means for calls
Strong> 12 dBBackground noise effectively disappears behind your voice on the other end.
Moderate5–12 dBNoise is noticeably quieter but still audible in quiet moments between words.
Weak1–5 dBLittle practical difference — listeners will still hear the original noise.
None< 1 dBSuppression is not engaging for this noise type on your current setup.

These bands come directly from this tool's own verdict logic, not an external or estimated standard — run the test to see which one your setup falls into.

Step-by-Step

How to Run the Test

  1. Pick a noise profile above — typing, fan/HVAC hum, or background chatter — matching whichever noise you actually deal with most.
  2. Click "Run Test" and allow microphone access when your browser prompts you. This only happens once per site.
  3. Stay quiet during both passes. The test plays the noise profile twice — once with suppression off, once with it on — and measures your empty-room noise floor each time, not your voice.
  4. Read your Reduction figure and verdict, then try a different noise profile to see whether your result holds across noise types.

Notes

What this is and is not measuring

Your browser exposes a standard noiseSuppression constraint that every major browser implements to some degree — this toggles that exact setting and measures the real difference in captured noise energy. It is a genuine before/after comparison of the same noise profile under the same conditions.

What it cannot isolate: some webcams and USB microphones run their own proprietary noise suppression in hardware or firmware, entirely separate from anything a browser-level constraint touches. If your device does this, you may see strong suppression even with the browser setting off — that is your hardware doing the work, not this toggle.

Common Issues

Troubleshooting & Fixes

Microphone access blocked or no prompt appearsClick the camera/mic icon in your browser's address bar and confirm this site is allowed, or check your browser's site settings directly. Chrome, Edge, and Firefox all handle this from the same address-bar icon.
Result shows 0dB or reads as blankYour OS may be blocking microphone access at a level the browser can't see — on Windows, check Settings → Privacy & Security → Microphone, including "Let desktop apps access your microphone." On macOS, check System Settings → Privacy & Security → Microphone.
Reduction is consistently near 0dB no matter the profileSome browsers or devices silently ignore the noiseSuppression constraint rather than rejecting it outright. Try the same test in a different browser to see whether the result changes — a large difference points to a browser-level limitation rather than a hardware one.
You hear the test noise through your speakers but nothing changes on screenConfirm your system's default input device matches the microphone you expect — an unrelated built-in mic can be capturing while your USB mic sits idle.

Common Questions

Frequently Asked Questions

How does this test noise suppression?
It plays a synthesized noise profile through your speakers while your mic is live, then compares the captured residual noise with your browser's noiseSuppression setting on versus off. That is a real, standard constraint every major browser exposes, not a simulated result.
Does this test my webcam's own hardware noise suppression?
No, and it should not claim to. Some microphones and webcams run their own proprietary suppression in hardware or firmware, upstream of anything a browser constraint can control. This measures only the layer the browser itself exposes.
Why use synthesized noise instead of a recording?
Synthesized profiles built from filtered noise avoid any licensing question entirely, and are exactly reproducible for a fair before-and-after comparison every time you run the test.
What is a good noise suppression result?
A reduction beyond roughly 12dB is strong and clearly audible. Under about 1dB means suppression is not doing meaningful work for that specific noise type on your current device and browser combination.
Why does my result differ between typing, fan, and chatter noise?
Noise suppression algorithms are typically tuned around steady, broadband noise like fans and hums — they often handle that more effectively than the sharp, irregular transients typing produces, or the speech-like frequencies of background chatter. A mismatch between profiles is a real, expected finding, not an error.