Where the 4:5 aspect ratio is used
4:5 is slightly taller than square. It has long been the tallest shape Instagram shows in the main feed without cropping, so it takes more screen space while people scroll.
- Instagram portraits: Tall feed photos without switching to Reels.
- Facebook feeds: Vertical posts that avoid auto-cropping on mobile.
- Pinterest: Shorter vertical pins.
- Display ads: Portrait banner placements.
4:5 resolution cheat sheet
| Name | Width × height | Typical use |
|---|---|---|
| Small portrait | 800 × 1000 px | Social graphics and email images |
| Instagram portrait post | 1080 × 1350 px | The standard Instagram portrait size |
| 8 × 10 in at 300 dpi | 2400 × 3000 px | Print-ready portrait |
| High resolution | 3200 × 4000 px | Professional asset delivery |
Tip: A 1080 × 1350 post is 25% taller than a 1080 × 1080 square, so it fills more of the feed on a phone.
How to calculate 4:5 dimensions
Height = width × 5 ÷ 4. Width = height × 4 ÷ 5. Round to whole pixels; many video encoders also need even numbers.
CSS for a 4:5 box
.media { aspect-ratio: 4 / 5; width: 100%; }