Instagram Post Size: what it does
Instagram posts no longer have to be square. A 1080 × 1080 image uses a 1:1 aspect ratio, 1080 × 1350 uses 4:5 and 1080 × 1440 uses 3:4. Different posting methods and connected publishing services may treat formats differently, so checking the final in-app preview remains important.
Common social image dimensions
| Use | Pixel dimensions | Aspect ratio |
|---|---|---|
| Instagram square | 1080 × 1080 | 1:1 |
| Instagram portrait | 1080 × 1350 | 4:5 |
| Instagram tall photo | 1080 × 1440 | 3:4 |
| Story / Reels cover | 1080 × 1920 | 9:16 |
| TikTok profile output | 400 × 400 | 1:1 |
The chosen feed ratios describe exported image dimensions; Instagram can use different thumbnail crops in profile or discovery surfaces.
Pick square, 4:5 or taller framing intentionally
Square 1080 × 1080 photos offer a balanced, familiar feed composition. Portrait 1080 × 1350 uses a 4:5 frame; a taller 3:4 preparation size can also make sense for some photo publishing paths. Publishing interfaces and thumbnail crops can differ, so check the in-app preview.
When a feed image must remain legible in a profile grid, keep captions and key elements near the middle. The feed image and the cropped profile thumbnail are separate surfaces; a single file cannot guarantee the identical appearance in both.
Plan square, portrait and tall feed posts
Choose a feed preset in Social Presets: 1080 × 1080 square, 1080 × 1350 portrait, or 1080 × 1440 tall image. View the result before posting, especially if your subject sits near the crop boundaries.
Before you download: limits and trade-offs
The 4:5 and 3:4 ratios do not show identically in all Instagram surfaces. Feed crops, profile thumbnails and uploads by third-party publishing tools may differ. Use the preview as a design aid, not a guarantee of a fixed on-platform rendering.
Quick answers for this image task
What is the classic Instagram portrait ratio?
4:5, for example 1080 × 1350 pixels.
Does choosing 1080 × 1440 force every app to show 3:4?
No. Platform handling can change and may crop or adapt the upload.