1280 x 720 pixels
1280 x 720 px is a 16:9 landscape size, the YouTube thumbnail size. 1280 divided by 720 is 1.7778, and dividing both by their greatest common divisor, 80, reduces the fraction exactly to 16:9. It is 0.92 megapixels (921,600 pixels) with a diagonal of 1,469 px.
Who uses 1280 x 720
| Platform | Asset | Role | Source |
|---|---|---|---|
| YouTube | Thumbnail | Long-standing 16:9 baseline | Documented |
1280x720 vs 720x1280
720x1280 is the same two numbers swapped, and that makes it a different shape: 9:16 portrait instead of 16:9 landscape. Width is always written first, so 1280x720 is 1280 pixels wide and 720 tall, while 720x1280 is 720 wide and 1280 tall. As decimals that is 1.7778 against 0.5625. Cropping one to fill the other keeps only 31.6 percent of the picture, so the two are not interchangeable.
No platform size in this dataset is 720x1280: every use listed above is 1280 wide by 720 tall. If an export meant for one of them comes out as 720x1280, 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 1280 by 720 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.
16:9 is a shape rather than a size. See every size that uses the 16:9 aspect ratio.
Resize an image to 1280 x 720
Preloaded to this exact size. It runs in your browser, so nothing is uploaded anywhere.
Keep the 1280x720 shape at another size
Preloaded with 16:9, the exact ratio of 1280 by 720. Type a new width or height and the calculator solves the other side, so the shape stays identical.
Common ratios
Type in either the width or the height and the other side solves to keep the ratio.
16:9 at 1280 px wide
1280 x 720px
The height is 720 px.
height = 1280 x 9 / 16 = 720 px.
- Ratio
- 16:9
- Decimal
- 1.7778
- Result ratio
- 16:9
Starting from other numbers? Open 1280 x 720 in the aspect ratio calculator to find the ratio of any width and height.
Questions about 1280x720
Is 1280x720 16:9?
Closest other sizes
Nearest by shape, so a crop between any of these loses the least. Sorted by how far each one is from 1.7778.
Every size on one page: the cheat sheet. Last verified 2026-07-27.