The fastest way to test your webcam on Windows 11 is to open an online camera test — you'll see a live preview with resolution and FPS data. Alternatively, open the built-in Camera app from the Start menu; if it shows video, your camera hardware and drivers work. To check which camera Windows is using: go to Settings > Bluetooth & devices > Cameras and you'll see all connected cameras. Click on one to test it and see a preview. If the camera doesn't appear, check Settings > Privacy & security > Camera and ensure camera access is on and your apps (including your browser) are allowed. For USB webcams, try a different port and check Device Manager > Cameras for driver warnings. After any changes, restart the app you want to use the camera in.