Webcam questions, fixes and result guides.
Practical answers for common webcam problems, confusing results and setup questions — with a direct path back to the live test.
Why is my webcam showing a black screen?
Camera permission may be blocked, another app may already be using the device, the wrong camera may be selected or a hardware privacy shutter may be closed. Stop other camera apps and reselect the camera.
How do I switch between front and rear cameras?
On supported mobile devices, the browser can request user-facing or environment-facing cameras. Availability depends on the device, browser and permission state.
Why is webcam resolution lower than the advertised camera resolution?
Browsers negotiate a stream size based on defaults, bandwidth, device capabilities and system load. The active video track can therefore be lower than the sensor's maximum still-photo resolution.
Does Devices Test Hub record my webcam?
No recording feature is used. The camera stream is attached to the local browser preview and tracks are stopped when you press Stop or leave the component.
Why is my webcam resolution lower than advertised?
Browsers negotiate a stream configuration based on defaults, device capabilities and system load. The active stream can be lower than the sensor's maximum resolution.
How accurate is this webcam tool?
Camera names and alternate cameras may not appear until browser permission is granted.
What should I do if the webcam result looks wrong?
Close conferencing apps using the camera, verify OS privacy permissions and reconnect USB cameras. If the preview is black, switch the camera selector or refresh after granting permission.