Quick Spec
EasyFree browser-based tool. No upload to any server.
Resize for Instagram Post Photo
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JPEG, PNG, HEIC — any size
Upload a photo to see the result
Instagram supports three aspect ratios for feed posts: square (1:1), portrait (4:5), and landscape (1.91:1). The sweet spot for maximum feed real estate is the 1080×1350 portrait orientation — it takes up more screen space than square while scrolling. All photos should be at least 1080 pixels wide; anything smaller gets upscaled and looks blurry.
What Makes This Specification Unique
Portrait 4:5 (1080×1350) takes up the most feed space — best for engagement
Instagram compresses heavily — upload the highest quality original
Carousel posts can mix aspect ratios but the first image sets the ratio for all
Stories/Reels use 9:16 (1080×1920) — completely different from feed posts
ExactPix Tool Rules for This Spec
When you use the ExactPix tool on this page, it's pre-configured with these rules:
Square posts: 1080×1080px | Portrait: 1080×1350px | Landscape: 1080×566px
Instagram compresses photos aggressively — upload at highest quality
Applications That Require This Photo
Frequently Asked Questions
Official Sources
Reviewed: 2026-05-01