A camera light that comes on unexpectedly usually has an ordinary cause: an app or a browser tab using the camera, such as a video call app that opened in the background or a website you allowed earlier. Webcam spying does happen, but it needs malicious software on your computer, and that usually leaves traces you can check. In a few minutes you can see which apps and sites have camera access, which ones used it recently, and whether anything suspicious is installed. Then a cover or shutter settles the question for good.
See how your camera light behaves
Start the webcam test and watch the light come on, then press Stop test and watch it go off. It also shows the picture and checks the lighting. The video is processed in your browser and never uploaded.
How the camera light works
On a MacBook or iMac, a green light beside the camera glows whenever the camera is on. Apple says its Mac cameras are engineered so they can't turn on without that light also turning on, whatever app is asking. The MacBook Neo has no separate light and shows a green dot at the top right of the screen instead. Apple runs that indicator in a protected, separate part of the chip, designed so that even software with full control of macOS can't use the camera without the dot showing.
Windows laptops and external webcams vary. On many, the camera's own chip switches the light on when the camera starts, so a normal app can't avoid it. But how tightly the light is tied to the camera depends on the model, and some webcams have even shipped with software that could turn the light off. Security researchers have also shown, on an older laptop model, that rewriting the camera's firmware could disable its light. That takes a determined, targeted attack, but it's why the light is a good sign rather than a guarantee on a PC. If your camera has no light at all, Windows shows a notification when the camera turns on or off.
Look for the on-screen indicators
- Mac: a green dot next to the Control Center icon in the menu bar means a camera is in use. An orange dot means the microphone, and if both are on you see only the green one. Open Control Center, and the top of it can name the apps using the camera or microphone.
- Windows 11: the camera light, or the notification on cameras without one, shows when the camera turns on. A microphone icon appears next to the clock while an app is using the microphone.
- Browsers: when a website uses the camera, the browser shows an icon in or next to the address bar, and Chrome adds a red dot to the tab. Closing the tab turns the camera off.
See which apps and sites used your camera
These lists show who is allowed to use the camera, and on Windows, who used it recently. Check them while the light is on if you can.
Windows 11
Open Settings > Privacy & security > Camera. You'll see which apps are allowed to use it, with a separate list under Let desktop apps access your camera. Expand Recent activity to see which apps used the camera in the past 7 days and when; on some versions this shows as a Last accessed line under each app instead. Turn off any app you don't recognize. Desktop programs can usually only be switched off as a group, so uninstall one you don't want. Microsoft notes that some desktop programs may not appear in these lists, so treat them as a strong clue, not a complete record.
Mac
Open System Settings > Privacy & Security > Camera. It lists every app you've installed that has asked to use the camera, and you can turn each one off. Apple's own apps, like FaceTime and Photo Booth, have access without appearing there. System Settings doesn't show when each app last used the camera, so for a live view, open Control Center while the light is on.
Browsers
- Chrome: Settings > Privacy and security > Site settings > Camera.
- Safari: Safari > Settings > Websites > Camera.
- Firefox: Settings > Privacy & Security, then Settings next to Camera under Permissions.
- Edge: open Settings and search for camera to reach its site permissions.
Remove sites you don't recognize or no longer use. A website can only use your camera while one of its pages is open, and only after you've allowed it. If you turn off something you need and the camera stops working in it, the webcam test's troubleshooting shows how to turn access back on.
Why the light turns on by itself
- A video app in the background. Teams, Zoom, Skype and similar apps can start with your computer and keep running after you close their window. Some turn the camera on to show a preview, for example when you open their video settings.
- Face sign-in. On a laptop with Windows Hello face recognition, the infrared camera turns on to look for you at the lock screen or when an app asks you to confirm it's you. You may see a light or a faint red glow. Microsoft notes that Windows Hello can use the camera even when app access is off.
- A forgotten browser tab. A call or a camera site left open in another tab or window keeps the camera on until you close it.
- Laptop maker utilities. Some laptops come with software that uses the camera to notice when you sit down or walk away, for example to dim or lock the screen.
When the light comes on, check the indicators and lists above straight away. If they name an app you recognize, quit it or turn off its camera access. If the light comes on and nothing is named anywhere, or a name you don't recognize keeps appearing, move on to the malware checks.
Check for malware and remote-access tools
- Windows: open Windows Security, select Virus & threat protection and run a Quick scan. For a deeper look, open Scan options and choose Full scan, or Microsoft Defender Antivirus (offline scan), which restarts the PC and scans it from outside Windows, where malware that hides while Windows runs can be found.
- Mac: macOS has built-in malware protection that updates itself, so keep macOS up to date. Open System Settings > General > Login Items & Extensions and look for anything that opens at login that you don't recognize, and check your Applications folder for apps you didn't install.
- Remote-access apps: look for tools like TeamViewer or AnyDesk that you didn't set up. They're harmless when you use them on purpose, but fake tech-support callers often get people to install one. Uninstall any you don't use, and if you find one you didn't install, change your important passwords from another device.
- Updates: install updates for your operating system, browser and webcam software. Updates close the security holes that malicious software uses to get in.
If you still see signs of trouble, a trusted repair shop or your workplace IT team can check the computer for you. Resetting the computer, after backing up your files, removes almost all malware. If you think someone you know installed monitoring software, think about your safety before removing it, because removing it can alert them. Support services for domestic abuse can help you plan.
Use a cover or shutter
A cover is the one fix that doesn't depend on software: if the lens is blocked, nothing can see through it, whatever runs on the computer. Many laptops and webcams now have a built-in sliding shutter, and some laptops have a key that turns the camera off. Otherwise a slide-on cover works.
On a Mac laptop, be careful. Apple warns that closing a MacBook with a cover over the camera can damage the display, because there's very little room between the screen and the keyboard. If you need a cover, Apple says to use one no thicker than printer paper (about 0.1 mm), or to remove a thicker one before closing the lid. A cover can also block the light sensor behind automatic brightness and True Tone. Remember that a cover only blocks video. The microphone still works, so check the Microphone list in the same privacy settings too, and unplug an external webcam when you're not using it.
Are online webcam tests safe?
A website can only use your camera after you allow it in the browser's prompt, browsers only allow it on secure https pages, and the browser's camera indicator shows while the camera is on. What happens to the video next depends on the site. The CheckHut webcam test works it all out on your device: the preview, the real resolution and frame rate, and the lighting verdict are calculated in your browser, and the video is never uploaded. When you stop the test or close the tab, the camera turns off. If your browser offers Allow this time, choose it, or remove the permission in the browser's camera settings when you're done.
Questions
Can someone watch me through my webcam without the light coming on?
On a recent Mac, Apple designs the camera so it can't turn on without the light or on-screen indicator. On Windows PCs and external webcams it depends on the model, and on some the light can be controlled by software. Either way, spying needs malicious software on your computer first, which is why the malware checks and camera access lists are the real test. A cover removes the question for video.
I got an email saying a hacker recorded me through my webcam. Is it real?
Almost certainly not. These emails are a common scam sent to huge numbers of people, often quoting an old password from a data breach to seem convincing. Don't reply or pay. Change that password anywhere you still use it, and turn on two-step verification.
Can a website turn on my camera without asking?
No. Browsers ask before a site can use the camera and remember your answer for that site. A site you allowed before can use it again while one of its pages is open, which is why it's worth clearing old permissions.