Portrait video aspect ratio (1080×1350) — the current preferred format for Instagram and Facebook feed (non-Reels) posts.
Last verified · 2026-05-29 · by Moe Ameen
4:5 is Instagram's preferred feed ratio as of 2023+. At 1080×1350 pixels, it occupies more vertical screen space than 1:1 in the mobile feed, which translates to higher dwell time and higher engagement per impression. Facebook feed renders 4:5 cleanly as well.
4:5 does not work for Reels (which require 9:16) or for YouTube (which prefers 16:9). It's a feed-specific format, not a cross-platform one. Creators who want one master asset for everything settle on 1:1 or produce both 4:5 (for IG feed) and 9:16 (for Reels) versions.
Kompozy's Photo Posts and Persona Photos default to 4:5 when the destination outlet is Instagram or Facebook feed.
4:5 is a portrait video aspect ratio at 1080×1350 pixels, the preferred format for Instagram and Facebook feed (non-Reels) posts since 2023. It occupies more vertical screen space than 1:1 in the mobile feed, which translates to higher dwell time and higher engagement per impression.
At 1080×1350, 4:5 takes up more vertical real estate in the mobile feed than a 1:1 square does. More screen space means longer dwell time and more engagement per impression, which is why it became Instagram's preferred feed ratio.
No. 4:5 does not work for Reels, which require 9:16, or for YouTube, which prefers 16:9. It is a feed-specific format, not a cross-platform one.
Creators who want a single master asset settle on 1:1, or they produce both versions: 4:5 for Instagram feed and 9:16 for Reels. There is no single ratio that is optimal across feed, Reels, and YouTube.
Kompozy's Photo Posts and Persona Photos default to 4:5 when the destination outlet is Instagram or Facebook feed, since that is the preferred feed ratio on both platforms.