This flashes bright colors very fast. Don’t use it if you are sensitive to flashing light.
Clear image retention
This can fade temporary image retention, but it can’t fix permanent burn-in. Noise flickers fast, so skip it if flashing light affects you.
Screen light
Start test tones at a low volume, especially with headphones, and skip the pixel fixer and the noise pattern if flashing light affects you. These tests check your devices, not your hearing or eyesight.
A one-click online mic test: allow access, speak, and watch the meter and waveform react within a second. Normal speech should peak around −20 to −10 dBFS. Record 5 seconds to hear how your headset or USB mic really sounds before a call.
How to use
- Pick a tab: Microphone, Webcam, Speakers or Screen.
- Microphone: press Test microphone and allow access. Speak — the meter, wave and status show whether sound arrives. Record 5 s to hear yourself.
- Webcam: press Start camera and allow access. The badge shows the real resolution and measured frames per second; switch cameras or resolutions below.
- Speakers: tap Left, Center or Right. Use the frequency slider or the sweep to check bass and treble.
- Screen: tap a color or start the full-screen test, then tap or press → to step through colors. Look for dots that don’t match.
- The browser asks for permission only after you press a start button. Audio and video never leave your device; recordings are kept in memory until you close the page.
- If no sound is detected, check the mute switch on your headset, the input level in your system sound settings and that the right device is selected.
- Out of phase should sound thin and hard to place. If In phase sounds that way instead, one speaker’s wires are swapped.
- A dead pixel stays black on every color; a stuck pixel stays red, green or blue. The fixer may help stuck pixels after 5–10 minutes, but it can’t repair dead ones.
Reading the meter
The level is shown in dBFS, decibels relative to full scale, where 0 dBFS is the loudest a digital input can record. Normal speech at arm's length usually peaks around −20 to −10 dBFS. Above about −1 dBFS the status warns of clipping, which sounds harsh and distorted; turn the input gain down. If the meter barely moves above −50 dBFS while you talk, the gain is too low or the wrong mic is selected.
The spectrum shows which frequencies arrive: speech sits mostly between about 100 Hz and 4 kHz. A flat line with only low hum often means a muted headset or a loose cable.
If no sound is detected
Check the mute switch on the headset or cable, then the input device and level in your system sound settings (on Windows, Sound settings > Input; on macOS, System Settings > Sound > Input). Make sure no other app is holding the mic exclusively, and that the browser has permission for this site. Bluetooth headsets often switch to a lower-quality call mode when the mic is in use, which is normal.
Frequently asked questions
How do I know if my mic is working?
Press Test microphone, allow access and speak. If the meter and waveform move and the status turns green, sound is arriving.
What is a good mic level?
Speech peaking around −20 to −10 dBFS is a healthy level. Constant peaks near 0 dBFS will clip; levels below −40 dBFS are too quiet.
Why does my mic sound muffled or robotic?
Bluetooth headsets switch to a narrow-band call mode when the mic is on, and noise suppression in calling apps can add artefacts. A wired or USB mic usually sounds clearer.
Can I hear myself?
Yes. Record 5 seconds and play it back. There is no live monitoring, so you won't get feedback through your speakers.
Is my recording saved?
No. The 5-second clip stays in memory until you close the page and is never uploaded.