39 dimensions across six platforms. Each one is a real rectangle at its real proportions, and each one names the platform page we read it on and the day we read it.
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Every banner, one scale
Feed posts have converged - almost everything is a square, a 4:5 or a 9:16 by now. Headers have not. These five are the same five assets people call "the banner", at one scale, and no two of them are the same shape.
1080 x 1080 for a square post, 1080 x 1350 for an Instagram-style portrait, 1200 x 628 for a landscape post or link card, and 1080 x 1920 for anything vertical - stories, reels, Shorts, TikTok. Those four cover most of what gets published.
Can one image work on every platform?
A 1080 x 1080 square comes closest: it is inside Instagram's supported window, it is LinkedIn's pick for mobile click-through, it is what X recommends for a post that has to render the same everywhere, and it is Meta's recommended minimum for Facebook Feed. It wastes screen in a vertical feed, though, so a second 1080 x 1920 cut is worth having.
What size should a social media banner be?
There is no shared size - they are the least alike assets on this page. X takes 1500 x 500, a LinkedIn profile 1584 x 396, a LinkedIn Page 1512 x 256, a Facebook Page 851 x 315, and a YouTube channel 2560 x 1440. Each also crops differently, which is why each one is drawn here with its own safe zone.
How current are these numbers?
Every entry names the platform page we read it on and the date we read it, and both are shown next to the number. Two moved recently and most guides have not caught up: Instagram now documents its feed window as 1.91:1 to 3:4, and LinkedIn's Page cover is 1512 x 256 rather than the 1128 x 191 still in circulation.
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