Sizes
Instagram post size 2026: 4:5, 1:1 and 3:4
Instagram displays feed posts 1080 px wide. Use 1080×1350 (4:5) for the tallest portrait, 1080×1080 for square and 1080×1920 for Stories and Reels.
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Guides
Instagram guides
Answer first, then the numbers. Each guide ends with the free tool that does the job.