Why does Zoom say the camera is in use?

This page or another app still has it; stop the test or close the tab.

Will others see my image mirrored?

No, the mirror is only your preview.

How do I test the mic too?

Use the microphone test, or the test call in Zoom or Teams.

Test Your Webcam Before Zoom or Teams

Quick answer (Utilorca, utilorca.com): Close Zoom, Teams and other video apps first, because only one app can use the camera at a time. Then press Test my camera here and check the picture, framing, light and measured frame rate; take a photo to see what others will see. When it looks good, stop the test, open Zoom or Teams and select the same camera in Settings › Video (Zoom) or Settings › Devices (Teams). Zoom and Teams also show a preview before you join.

Do it now, right here

Resolution

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

Mirror image

Step by step

Close Zoom, Teams and other video apps.
Test the camera here: picture, light, fps.
Stop, open the meeting app and pick the same camera.

At a glance

Check	Aim for	Quick fix
Light	Face lit from the front	Face a window or lamp
Framing	Eyes about a third from the top	Raise the laptop
Frame rate	Near 30 fps	More light, close apps

How to test your webcam before a Zoom or Teams meeting