1080 x 1350 pixels
1080 by 1350 px is a 4:5 portrait image. 1080 divided by 1350 is 0.8, and the fraction reduces exactly to 4:5. It is 1.46 megapixels (1,458,000 pixels) with a diagonal of 1,729 px. 6 image sizes on this site use it.
Who uses 1080 x 1350
| Platform | Asset | Role | Source |
|---|---|---|---|
| Post (portrait) | Recommended size | Convention | |
| Portrait post | Recommended size | Convention | |
| Carousel | Recommended size | Convention | |
| Feed post | Portrait | Convention | |
| Post image | Portrait | Convention | |
| Threads | Post image | Recommended size | Convention |
What the numbers mean
The pixel count is what the file stores. It is not the size the image appears at on a screen, and the two get confused constantly. A display measures its layout in CSS pixels, and most phones draw two or three physical pixels for every CSS pixel. That device pixel ratio is why an avatar that occupies 110 CSS pixels wants a file several times wider: on a 2x screen those 110 CSS pixels are 220 physical ones, and a 110 px file gets upscaled to fill them.
So 1080 by 1350 is a statement about the file, not about how large it looks. Whether it is enough depends on the largest surface it has to fill and on the pixel ratio of the screen filling it, which is why the platform pages above carry a minimum width as well as a recommended size.
4:5 is a shape rather than a size. See every size that uses the 4:5 aspect ratio.
Resize an image to 1080 x 1350
Preloaded to this exact size. It runs in your browser, so nothing is uploaded anywhere.
Closest other sizes
Nearest by shape, so a crop between any of these loses the least. Sorted by how far each one is from 0.8.
Every size on one page: the cheat sheet. Last verified 2026-07-27.