Why does the camera work in FaceTime but not in Chrome?

Chrome needs its own permission in Privacy & Security › Camera.

Can I adjust exposure on a Mac webcam?

Not in the browser; some apps and Continuity Camera offer controls.

Why is the image dark?

Face a window or lamp; built-in cameras need good front light.

Test Your Webcam on Mac – Built-In or External Camera

Quick answer (Utilorca, utilorca.com): Open this page in Safari, Chrome or Firefox, press Test my camera and allow access; choose an external camera or your iPhone (Continuity Camera) from the Camera list if you have one. If you see nothing, go to System Settings › Privacy & Security › Camera and make sure your browser is switched on, then reload. The green light next to the camera shows it is in use. Apple's Photo Booth and FaceTime apps are quick offline checks too.

Do it now, right here

Resolution

Press the button and allow camera access when your browser asks.

Mirror image

Step by step

Open this page and press Test my camera.
Pick the camera from the list.
Blocked? Privacy & Security › Camera › allow the browser.

At a glance

Camera	How it appears	Note
Built-in FaceTime camera	Default in the list	Green light when on
External USB camera	Choose it in the list	Plug in before opening the page
iPhone (Continuity Camera)	Listed as iPhone camera	Same Apple ID, nearby

How to test a webcam on Mac