1080x1350 Pixels: 4:5 Ratio, Instagram Post Size

Who uses 1080 x 1350

Platform image sizes that are exactly 1080 by 1350 pixels
Platform	Asset	Role	Source
Instagram	Post (portrait)	Recommended size	Convention
Instagram	Portrait post	Recommended size	Convention
Instagram	Carousel	Recommended size	Convention
Facebook	Feed post	Portrait	Convention
LinkedIn	Post image	Portrait	Convention
Threads	Post image	Recommended size	Convention

1080x1350 vs 1350x1080

1350x1080 is the same two numbers swapped, and that makes it a different shape: 5:4 landscape instead of 4:5 portrait. Width is always written first, so 1080x1350 is 1080 pixels wide and 1350 tall, while 1350x1080 is 1350 wide and 1080 tall. As decimals that is 0.8 against 1.25. Cropping one to fill the other keeps only 64 percent of the picture, so the two are not interchangeable.

No platform size in this dataset is 1350x1080: every use listed above is 1080 wide by 1350 tall. If an export meant for one of them comes out as 1350x1080, the two numbers were entered the wrong way round.

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.

Keep the 1080x1350 shape at another size

Preloaded with 4:5, the exact ratio of 1080 by 1350. Type a new width or height and the calculator solves the other side, so the shape stays identical.

Ratio widthRatio height

Common ratios

Width (px)Height (px)

Type in either the width or the height and the other side solves to keep the ratio.

4:5 at 1080 px wide

1080 x 1350px

The height is 1350 px.

height = 1080 x 5 / 4 = 1350 px.

Ratio: 4:5
Decimal: 0.8
Result ratio: 4:5

Starting from other numbers? Open 1080 x 1350 in the aspect ratio calculator to find the ratio of any width and height.

Questions about 1080x1350

Is 1080x1350 4:5?

Yes, exactly. The greatest common divisor of 1080 and 1350 is 270. 1080 / 270 = 4 and 1350 / 270 = 5, so 1080x1350 reduces to 4:5. As a check, 1080 / 1350 = 0.8, the same as 4 / 5. Written with an x, 4x5 is the same ratio.

What ratio is 1080x1350?

4:5, a portrait ratio. 1350 / 1080 = 1.25, so the frame is 1.25 times as tall as it is wide. The ratio describes the shape, not the size: 1440x1800 is 4:5 as well, because 1440 / 1800 = 0.8 just like 1080 / 1350.

Which number is the width in 1080x1350?

1080. Pixel sizes are written width first, then height, so 1080x1350 is 1080 pixels wide and 1350 pixels tall, a portrait frame. Swap the numbers and 1350x1080 is a 5:4 landscape frame, which is a different shape.

Is A4 portrait the same shape as 1080 by 1350 px?

No. A4 follows ISO 216, where every A size has sides in the ratio 1:sqrt(2), so A4 portrait is 210 by 297 mm and width divided by height is about 0.7071. 1080 by 1350 px is 0.8, so A4 is taller and narrower. At 1080 px wide an A4 shaped image would be 1527 px tall, 177 px more than 1350.

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.