Short answer: use 1080 × 1350 px (4:5) for image posts — it fills the most space in the mobile feed.
| Type | Pixels | Ratio |
|---|---|---|
| Portrait image post | 1080 × 1350 | 4:5 |
| Square image post | 1080 × 1080 | 1:1 |
| Link preview (Open Graph) | 1200 × 630 | 1.91:1 |
| Event cover | 1920 × 1005 | 1.91:1 |
| Story | 1080 × 1920 | 9:16 |
Tips
- Images taller than 4:5 are cropped in the feed preview.
- For website links, the preview image comes from the page’s Open Graph tag, 1200 × 630.
- The same 1080 × 1350 image works as an Instagram portrait post.