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Add full-screen and bubble effects on Mac
You can add special effects to your messages—full-screen animations like fireworks, balloons, or confetti; bubble effects like a slam or echo; or interactive effects, like invisible ink that your friends need to swipe over to read your text.

Go to the Messages app
on your Mac.
Select a conversation.
Enter your message in the field at the bottom of the window.
Click
, click
, then click an effect.
When you select an effect, you see a preview of it.
To send it, press Return on your keyboard or click
.