Big, small, subtle zooms — scaling is one of the core transforms you’ll use constantly. It’s fundamental to almost every animation.
Steps to scale objects
Select your layer and press S to reveal Scale.

Drag the percentage value to resize. Keep the chain icon linked to scale uniformly so your layer doesn’t get stretched.

To animate scale, click the stopwatch to set a keyframe, move the playhead forward, change the value, and After Effects automatically tweens between them.

One more thing
Hold Shift while dragging a corner handle in your comp viewer to keep proportions when scaling visually. Prevents accidental stretching.
Related how-tos
How to rotate objects in After Effects
How to change anchor point in After Effects
How to use easing for smooth animation in After Effects
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