How to Test Your Webcam When It's Not Working

A webcam usually fails at the worst possible moment: two minutes before a call, with everyone already waiting. The good news is that most webcam problems are not broken hardware. They are permissions, a privacy shutter, the wrong camera selected, or another app holding the camera. This guide tests the camera properly first, then works through the causes in the order they actually happen.

Step 1: Test the webcam outside your meeting app

Before changing any settings, find out whether the camera itself works. Open the webcam test on this site and press Start camera. The test shows you the live preview plus two facts your meeting app hides: the real resolution the camera is delivering and the camera's name as the system reports it. Your camera preview, like everything on this site, stays on your device — see our Privacy Policy for exactly how that works.

Read the result like this. A clear, moving preview means the camera hardware and its connection are fine, and your problem lives inside the meeting app's settings. A black screen, an error message, or no camera listed at all means you work through the checks below. A preview that works but looks soft or blocky is a resolution or lighting issue, covered further down.

Step 2: Check the permission, not just the camera

Every modern browser asks before a site can use your camera, and it remembers your answer. If you once clicked Block — or clicked past the prompt too fast — the site is refused silently every time after that, with no new prompt to rescue you. The fix is to reset the permission: click the icon at the left end of the address bar, open the site settings, and set Camera to Allow, then reload and try again.

The operating system has a second, separate permission layer. On Windows, open Settings, then Privacy and security, then Camera, and make sure both the master toggle and your browser are allowed. On a Mac, open System Settings, then Privacy and Security, then Camera, and check your browser is ticked. Either layer set to off produces the same dead camera, which is why checking only one of them leaves people stuck.

Step 3: Look for a shutter, a switch, or a second app

Many laptops now have a physical privacy shutter — a tiny sliding cover over the lens — or a keyboard key that disables the camera in hardware. Both produce a perfectly black image from a perfectly healthy camera. Check the lens bezel for a slider, and look for a camera icon on your function keys.

The other classic cause is a busy camera. Most webcams can only serve one app at a time, so if Zoom, Teams, a recording tool or another browser tab already has it, every other app gets an error or a black feed. Close the other apps completely — not just their windows, since many keep running in the background — then test again.

Step 4: Make sure the right camera is selected

Plug in a USB webcam, a dock, or even some capture devices and your system suddenly has two or three cameras. Apps pick one, and it is often not the one in front of you. The test readout on this page names the camera the browser is using; if that name is not your camera, change the selection in your system or app settings. This is also the moment to check a USB camera on a different port, and without a hub — underpowered hubs cause dropouts that look like camera faults.

Step 5: Judge the picture honestly

If the camera works but looks bad, separate the three usual causes. Softness and smearing when you move usually means low light: webcams slow their shutter in the dark, so add light in front of you, not behind you. Blockiness at arm's length is often just a 720p sensor doing its best — the resolution readout in the test tells you what you actually have. Text on a page held to the lens should be readable; if nothing is ever in focus, the lens may be fixed-focus and you are simply too close or too far from its sweet spot.

When it is actually broken

Suspect hardware when the camera fails the browser test on two different browsers, with permissions confirmed on, no other app running, and — for USB models — on a second port or a second computer. Flickering lines, a pink or green tint that never clears, or a camera that connects and disconnects as the lid moves all point to the device or its cable. If the device is new or under warranty, the notes from your test — what failed, in which apps, on what date — are exactly what support will ask for. Our guide to testing a microphone next, How to Test Your Microphone and Fix It When No One Can Hear You, covers the other half of call problems, and if the picture fault is on the screen rather than the camera, run the dead pixel and screen test too.