The right image size for every platform in 2026 (cheat sheet)

A single square image used to be a safe default everywhere. It isn't anymore — every major platform now has a ratio it actually favors, and using the wrong one either gets your post cropped awkwardly or just performs worse in the feed.

Here's the practical rundown. Instagram and Facebook feeds technically accept 1:1, but 4:5 claims noticeably more vertical space on a phone screen and tends to outperform a plain square. Stories and Reels are full-screen vertical at 9:16 — they need to be built for that shape from the start, not a cropped-down square with empty bars. LinkedIn feed posts favor a wider, landscape-leaning ratio around 1.91:1; a square gets shrunk down in the feed, while a landscape post fills the width and reads as native.

The common mistake is designing once at 1:1 and stretching or cropping that same file for everywhere else. It either clips a headline mid-word or leaves a cramped, off-center composition. The better approach is generating each post at the ratio it'll actually be seen in, not adapting a single size after the fact.

That's the whole reason Grafix's format picker now covers all of these natively — a square feed post, a 4:5 feed post, a 9:16 story, and a LinkedIn-native post are each their own generation, sized correctly from the start.