3:1 aspect ratio

Where 3:1 comes from

3:1 is a header band rather than an image. It exists because a profile page needs a strip across the top that stays a strip at any window width, with a profile picture overlapping it.

Which platforms use 3:1

Read live from the specification data, so this list changes when a platform does. Last verified 2026-07-27.

3:1 in pixels

Every row below is calculated from the ratio rather than looked up, so the heights are exact where the arithmetic is exact and rounded to the nearest whole pixel where it is not. A fractional pixel is not something a file can store.

Cropping and letterboxing into 3:1

Almost nothing photographic survives a 3:1 crop with its subject intact. Design for the shape instead: keep the meaningful content centred and treat the far edges as expendable, because responsive layouts trim them.

There are only two honest ways to put an image of one shape into a frame of another. Crop to fill keeps the frame full and throws away whatever does not fit, which is almost always what you want for a feed. Fit inside keeps the whole image and pads the remaining space, which is what you want when the image is a diagram, a screenshot or anything where losing an edge loses meaning. Scaling to fit without doing either, so the image is stretched, is the one option that is always wrong.

Work out a 3:1 size

Enter a width or a height and the calculator solves the other side. It runs in your browser and nothing is uploaded.

Questions about 3:1

Other ratios

See the aspect ratio guide for the shapes side by side, or the full cheat sheet for every size on one page.