Aspect Ratio

Aspect ratio is simply the shape of your image or video, the relationship between its width and its height.

When you sit down to launch a campaign, you are usually thinking about the offer and the copy, and the shape of the creative is the last thing on your mind, which is exactly why it trips so many people up. The common shapes in Meta ads are square at 1:1, portrait at 4:5 which sits nicely in the feed, and full-screen vertical at 9:16 which fills the whole phone for Stories and Reels. Each of these shapes is built for a different spot, so a square that looks perfectly fine in the feed ends up with ugly empty bars or an awkward crop the moment Meta forces it into a full-screen vertical Reel.

This matters because Meta does not show your ad in one place, it spreads it across many placements, and the shape of your creative decides whether it fits the spot it lands in or looks broken. Getting the aspect ratio right is one of those quiet differences between an ad that looks like it belongs there and one that looks like a mistake, and that difference shows up directly in whether someone stops scrolling for you or keeps going.

The practical move is not to make one square and hope it stretches to cover everything. You want to hand Meta more than one shape of the same creative, so it has a proper feed version and a proper full-screen version for Stories and Reels. Uploading a single square for every placement is the most common way people quietly throw away their best real estate, because the vertical, full-screen spots are where a lot of cheap attention lives, and a letterboxed square hands that attention straight back.

Give Meta the right shape for every screen, or watch your cheapest attention leak out through the bars around a stretched square.