Instagram Post Size In Pixels 2025 Pixels. The best size for an instagram post is 1080 x 1080 pixels with a 1:1 aspect ratio for square images. 1080 x 1920 (width x height) instagram reels aspect ratio:

A rundown of the changes. Instagram claims that the instagram photo size is at the highest possible resolution, up to an ideal instagram post size of 1080 pixels, and an aspect ratio between.