Share your screen using Messages on Mac
During a conversation in Messages, you can share your screen with the person you’re texting or they can share theirs with you. You can also allow someone to control your screen, or you can control theirs. It’s a great way to work together on a project or help someone do something on their computer.
Show someone else what’s on your screen
You can jump from Messages to FaceTime or Screen Sharing to bring apps, web pages and more into the conversation.
Go to the Messages app
on your Mac.Select a conversation for the person you want to show your screen to.
Click
at the top, then choose Share My Screen.When the other person accepts your invitation, an audio call begins automatically (so you can talk while you work) and the Screen Sharing app
opens. See Share the screen of another Mac.To stop sharing your screen, click
or 
in the menu bar, then click 
.
Allow someone to control your screen
When you share your screen with someone, they can click to highlight areas on your screen. You can also allow them to control your screen, which gives them complete access to your computer.
WARNING: Only allow people you trust to control your screen. They can do things you can do on your computer — open apps, create or delete documents, copy files from your computer to theirs, and so on.
Go to the Messages app
on your Mac.To respond to an invitation, select “Control my screen”, then click Accept. Or, while sharing your screen as above, click
in the menu bar, then click Allow Control so that it turns blue.Tip: If you don’t want someone to send you screen-sharing invitations, hold the pointer over the Decline button in the invitation you receive from them, click
, then click Block User.To take back control of your screen, click
in the menu bar, then do any of the following:If you still want to let the other person view your screen: Click Allow Control to remove the blue highlight.
If you want to stop screen sharing: Click
.
See another person’s screen
You can jump from Messages to FaceTime to see another person’s screen, or even remotely control it. You can also see their screen using the Screen Sharing app.
Go to the Messages app
on your Mac.Select a conversation for the person whose screen you want to see.
Click
at the top, then click Share My Screen.When the other person accepts your invitation, an audio call begins automatically (so you can talk while you work) and the Screen Sharing app opens. See Share the screen of another Mac.
To stop seeing the other person’s screen, click
or in the menu bar, then click .
You can also share screens without using the Messages app, using macOS screen sharing. See Turn Mac screen sharing on or off.