By late 2025 into 2026, Instagram quietly adjusted how feed posts are displayed.
❌ If you are still posting square or default 4:5 only, you are leaving screen space unused.
✔️ The new recommended maximum feed size is 1080 × 1440 px (3:4).
This taller format takes up more vertical space in the feed, feels more immersive, and reduces awkward cropping when used correctly.
Quick cheat sheet for 2026
➡️ Max feed exposure: 1080 × 1440 (3:4)
➡️ Standard portrait: 1080 × 1350 (4:5)
➡️ Square: 1080 × 1080 (1:1)
➡️ Landscape: 1080 × 566
➡️ Stories / Reels: 1080 × 1920 (9:16)
Important note.
3:4 posts may not be eligible for promoted ads and can get cropped in paid placements. For ads, 4:5 is still the safer choice.
Feed real estate matters more than captions now.
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