USB-C webcam permission: how to test access

Your USB-C webcam is plugged in, but a website cannot show its camera feed. The cause may be a permission saved in the browser, a camera privacy setting in your computer, or a connection problem. A missing permission prompt does not always mean the camera is broken.

Use the Camera Test to check whether the browser can open a live preview and report the camera's resolution and frame rate. Then check the permission settings at each level before troubleshooting the webcam itself.

Test USB-C webcam access

Open the Camera Test in the browser you want to use. Connect the webcam directly to the computer if possible, rather than through a hub.
If the browser asks to use the camera, choose Allow. Only grant access if you expect this page to use the camera.
Wait for the live preview. If it appears, check the reported resolution and frame rate. This confirms the browser has access to a working camera stream.
If no prompt appears and there is no preview, inspect the browser's camera permission for the page. It may already be saved as blocked, or permission may be allowed while a separate system setting prevents access.
Close other video-call or camera apps, unplug and reconnect the webcam, then reload the test. A camera may be busy in another app or may not have reconnected cleanly.

USB-C describes the connector shape, not what every cable can do. Some cables carry power but not data. If the camera does not appear to the computer, try a data-capable cable and another USB port before changing permission settings.

What the result means

The preview appears

The browser has permission and can receive a camera feed. If the webcam still fails on another site or in a calling app, check that site's permission and its camera choice. The test does not change which camera another app uses.

The browser shows a permission prompt

The browser has not yet saved a decision for this site, or it is asking again. Choose Allow to test the feed. If you choose Block, the page cannot open the camera until you change the saved permission.

No prompt appears and there is no preview

The browser may remember an earlier choice, the computer may be blocking camera access, or the camera may not be available to the browser. Check the page's camera permission first, then the operating system's privacy setting. Reload the page after changing either setting.

The preview appears, but the picture is poor or stops

Permission is working, so look beyond access settings. A low frame rate or resolution can be related to the camera, cable, USB hub, lighting, or another app using the device. Try a direct port and close other apps before deciding the webcam is faulty.

How to fix a blocked permission

Allow camera access for this site. In Chrome, open Settings › Privacy and security › Site settings › Camera and check the blocked list or the setting for the TooLab page. In Edge, open Settings › Cookies and site permissions › Camera. In Safari on Mac, open Safari › Settings › Websites › Camera, find the current site, and allow it. Reload the test after changing the setting.
Check the computer's camera privacy setting. In Windows 11, go to Settings › Privacy & security › Camera. Turn on camera access and access for desktop apps, then make sure your browser is not blocked. On macOS, open System Settings › Privacy & Security › Camera and allow the browser you are using.
Make sure the webcam is connected for data. Disconnect it, check that the plug is fully seated, and reconnect it to another USB-C port. If you are using an adapter, hub, or extension cable, test without it. A charging-only cable cannot carry the camera feed.
Close apps that may be using the camera. Quit video meetings, recording software, and other browser tabs that have camera access. Then reload the test. If the computer says the camera is in use, closing an app fully may release it.
Check the camera selected by the other app. If the test preview works but a meeting app does not, open that app's video settings and choose the USB-C webcam instead of the built-in camera. The browser test confirms access to a camera, but it does not set another app's camera choice.
Restart the browser, then the computer. Reopen the test after a browser restart. If the webcam is still missing from the computer, restart the computer with the webcam connected and test again.

When the webcam or cable may be faulty

If the camera fails in more than one browser and app, test it on another computer using a cable known to carry data. If it works there, the original computer's settings, USB port, or drivers may be the issue. If it fails on both computers, inspect the cable and connector for damage. A webcam that still cannot connect with a working cable may need warranty service or replacement.

Why a permission prompt may not appear

Browsers remember camera decisions by website. If you previously allowed or blocked access, reopening the page may not show a prompt at all. That saved browser choice is separate from the computer's privacy setting, so both must permit access. Changing a permission usually takes effect after you reload the page.

You can revoke the site's camera permission after testing by returning to its browser camera settings and changing access to Block or Ask.