Definition
Aspect ratio is the shape of an image or video, written as width to height. Meta placements favour 9:16, 4:5 and 1:1.
Aspect ratio explained
Use 9:16 for Reels and Stories and 4:5 for feeds. Supplying both helps each placement look native.
Example
A 1080 × 1920 video is 9:16.
See it in real ads
Browse millions of real Facebook and Instagram ads to see how top advertisers put these ideas into practice.