Check your camera, mic, speakers, mouse, keyboard, screen & more. All 12 tools below run locally in your browser. Nothing is uploaded.
Hardware fails gradually and ambiguously. A mouse switch starts registering one click as two, a key occasionally repeats itself, a monitor develops a pixel you only notice on a particular background. The hard part is confirming the fault is real before deciding to replace anything.
These tools measure exactly that: the interval between click events so a double-fire is visible as a number, repeated key events that arrive too close together to be human, every key held at once to check rollover, and full-screen color fields for finding dead or stuck pixels.
Before a video call, the webcam, microphone and speaker tests answer the usual question of whether the right device is working. The camera and microphone stay on your device: nothing is recorded to a server, and they switch off when you stop the test.
The Double-Click Tester times the gap between clicks. Anything under about 50ms that you did not intend is a switch bouncing. It is a hardware fault, and a consistent pattern of it is grounds for a warranty claim.
It is how many keys your keyboard can report simultaneously. Hold as many as you can in the Key Rollover tester: membrane boards typically stop at six, mechanical boards with full NKRO report every key you press.
Open the Webcam Test or Microphone Test and press start. Your browser asks for permission, then shows the live picture or sound level. If you have several devices, pick the one your call app should use from the list.
It can help you find one. The tool fills the screen with solid colors in turn. A dead pixel stays black on every field; a stuck one stays the same color on all of them.