Instagram Landscape Post size: 1080 x 566 pixels.

The widest image the Instagram feed accepts is 1.91:1, which at the standard 1080 pixel width comes to 1080 by 566. Meta's Ads Guide states the ratio range for feed images as 4:5 at one end and 1.91:1 at the other, with a 1 percent tolerance, so a 16:9 file is close enough that Instagram trims only a sliver from the sides rather than padding it.

A wide post is also the shortest post. At full column width it takes roughly 42 percent of the screen height that a 4:5 post takes, so a viewer passes it in less time. The profile grid makes the gap larger again: filling a 3:4 tile from a 1.91:1 image keeps only the middle 39 percent of the width, which cuts both ends off a group photo or a long headline.

Use this shape when the content is genuinely wide, such as a panorama, a product lineup or a screenshot of a dashboard, and when the same file is heading to X or a link card where 1.91:1 is the native shape. For anything designed for Instagram first, pad it onto a 1080 by 1350 canvas instead and keep the full width plus the extra height.