How to turn on a webcam and start video capture

The short answer

Most webcams have no separate power switch. A webcam turns on when an app asks to use it, as long as three things are true: the camera is physically available, the operating system allows access, and the app or website has permission. To start, open a camera app (Camera on Windows, Photo Booth or QuickTime Player on a Mac) or join a video call. The camera should switch on, and on most laptops an indicator light will come on next to the lens.

"Turning on" can mean three different things, and it helps to separate them:
Camera access: the system and the app are allowed to use the camera.
Video capture: the camera is actually producing a live image or recording.
Call quality: the image looks acceptable to other people on a call.
A camera can pass the first check and fail the second. It can also pass both and still look poor on a call. This guide covers the first two. It also explains why the camera might take a while to start.

Before you start: physical checks

• Look for a privacy shutter: a small slider over or beside the lens on many laptops and external webcams. If it is closed, the image will be black even when the camera is working.
• Check for a camera key or switch. Some laptops have a function key with a camera icon, or a switch on the side of the case, that disables the camera in hardware.
• For a USB webcam, plug it directly into the computer instead of a hub. If the computer doesn't detect it, try a different port.
• Close other apps that might be using the camera, such as call apps, recording software or browser tabs with a call open. On many systems only one app can use the camera at a time.

Turn on the webcam in Windows

• 1. Open Settings, then Privacy & security, then Camera. Make sure Camera access is on and Let apps access your camera is on. Check that the app you want is allowed in the list below. For traditional desktop programs, also turn on Let desktop apps access your camera.
• 2. On Windows 11, also open Settings, then Bluetooth & devices, then Cameras. Confirm the camera is listed and not disabled. This page also lists connected cameras, so you can see whether Windows detects the device at all.
• 3. Open the Camera app from the Start menu. Success check: a live image appears and the camera's indicator light, if it has one, turns on.
• 4. If the camera isn't listed anywhere, open Device Manager. Look under Cameras or Imaging devices. A camera with a down-arrow icon is disabled: right-click it and choose Enable device. A warning icon usually points to a driver problem.

Turn on the webcam on a Mac

• 1. A Mac has no on/off setting for the built-in camera. It turns on when an app uses it, and the green light next to the camera shows when it is active.
• 2. Open System Settings, then Privacy & Security, then Camera. Turn on the switch for each app that should use the camera. If an app isn't listed, it hasn't requested access yet. Open the app and try to use the camera so the permission request appears.
• 3. Open Photo Booth or FaceTime. Success check: a live image appears and the green light comes on.
• 4. If you changed a permission while an app was open, quit the app completely and reopen it. Some apps only read the permission when they start.

Allow the camera in a web browser

Browser-based calls need two permissions: one from the operating system for the browser itself, and one from the browser for the specific website.

• 1. Make sure the browser is allowed in your operating system's camera settings, as described above.
• 2. When a site asks to use your camera, choose Allow.
• 3. If you blocked the site earlier, click the icon at the left of the address bar to open the site's settings, set Camera to Allow, and reload the page.
• 4. If you have more than one camera, check the camera selection in both the browser's site settings and the call's own video settings.
• 5. Success check: your own video preview appears on the page. The browser usually shows a camera icon in the address bar or tab while the camera is in use.

Start recording video

System | App | How to record

Windows | Camera | Switch to video mode, then press the record button. Press it again to stop. Recordings are usually saved to the Camera Roll folder in Pictures.

Mac | QuickTime Player | Choose File, then New Movie Recording. Pick the camera and microphone from the menu next to the record button, then click record.

Mac | Photo Booth | Switch to video mode with the button at the lower left, then click record.

Success check: play the recording back. A working live preview shows that the camera is capturing images. Playing back a saved file confirms that recording and saving also work. Neither check confirms how you will look or sound to others on a call. Video is compressed differently during calls, and the microphone is a separate device. A recording with picture but no sound means the camera works and the audio input needs attention.

Why the camera takes a while to start

A short pause between opening an app and seeing a clear picture is normal. The system has to start the camera. The camera then adjusts exposure, white balance and sometimes focus, so the first moments may look dark, tinted or blurry. No reference figures for a normal startup time were available for this guide, and startup time varies between devices. Judge by consistency: compare the delay against your camera's usual behaviour rather than a fixed number.

• The camera is in use elsewhere. Another app or browser tab holding the camera can make a new app wait, show a black screen, or report that no camera was found. Close the other app and retry.
• Virtual camera or effects software is running. Background-effect tools and recording software can sit between the camera and the app. They add their own startup step and can hold the camera. Try selecting the physical camera directly in the app's video settings.
• USB connection problems. Hubs, long extension cables and busy ports can cause slow or failed detection. Connect the camera directly to the computer.
• Low light. In a dim room the camera may take longer to settle on an exposure. Add front-facing light and see whether the image stabilises faster.
• Permission prompts. The first time an app uses the camera, it may wait for a permission dialog. That dialog can be hidden behind other windows.
• Drivers and system updates. After an update, or with an outdated driver, the camera may initialise slowly or intermittently. Restarting the computer is a reasonable first step. Updating the camera driver through the computer maker's support tools is the next.

To narrow down a delay, test the camera in the built-in system app first. If it starts promptly there but slowly in a call app or browser, the cause is probably that app's settings, an effects layer or a permission issue rather than the camera itself. If it is slow everywhere, focus on the connection, the driver or the hardware.

When the camera still won't turn on

If no app shows an image after you have opened the shutter, checked any camera key, granted permissions and restarted, check whether the system detects the camera. Use Device Manager or the Cameras settings page on Windows, or System Information on a Mac. If the camera isn't detected at all, try another port or computer. An external camera that also fails on a second computer points to a hardware fault. A built-in camera that the system never detects may need the manufacturer's support.