Instagram Post vs Reel Aspect Ratio & Dimensions (2026)
Instagram Feed Posts support Square (1:1 - 1080x1080) and Portrait (4:5 - 1080x1350). Instagram Reels use full-screen vertical (9:16 - 1080x1920) to maximize mobile immersion.
Instagram Post (4:5 / 1:1)
Instagram Post (4:5 / 1:1) (4:5)
Scale Ratio: 0.8000Orientation: Portrait
Instagram Reel (9:16)
Instagram Reel (9:16) (9:16)
Scale Ratio: 0.5625Orientation: Portrait
Side-by-Side Specification Matrix
| Feature / Spec | Instagram Post (4:5 / 1:1) | Instagram Reel (9:16) |
|---|---|---|
| Aspect Ratio | 4:5 Portrait or 1:1 Square | 9:16 Vertical Full Screen |
| Optimal Resolution | 1080 x 1350 px (4:5) / 1080 x 1080 px (1:1) | 1080 x 1920 px (9:16) |
| Feed Display Area | Center Feed Card | Full Mobile Viewport + Feed Tab |
| Content Type | Photos, Carousels, Short Clips | Short-Form Immersive Video |
Instagram Post (4:5 / 1:1) Breakdown
PROS
- ✓ High visual sharpness without UI button overlaps
- ✓ Ideal for photo carousels and infographics
CONS
- ✕ Does not fill full mobile screen
Instagram Reel (9:16) Breakdown
PROS
- ✓ Fills 100% of mobile screen for maximum retention
- ✓ Favored heavily by Instagram discovery algorithm
CONS
- ✕ Bottom and right edges overlap with UI buttons and text overlays
Which Should You Choose?
Choose Instagram Post (4:5 / 1:1) If:
- →You are sharing high-res photography, infographics, or carousels
Choose Instagram Reel (9:16) If:
- →You are sharing engaging short videos to reach new audiences
Comparison FAQs
Will Instagram crop a 16:9 video in Reels?
Yes! Instagram Reels forces a 9:16 vertical ratio. Horizontal 16:9 videos will be cropped or pillarboxed.