1:1 aspect ratio (square): resolutions and sizes
1:1 means the height equals the width, so width ÷ height = 1. Exact 1:1 sizes are any whole width with the same height, such as 1080 × 1080.
Published · Updated · Sources last verified
At a glance
1:1
1:1 is 1:1.
- Decimal
- 1:1
- Height as share of width
- 100%
- Exact sizes
- any whole width, with the same height
Crop common sizes to 1:1
| Size | Centered 1:1 crop | Share kept | Exact |
|---|---|---|---|
| 1920 × 1080 | 1080 × 1080 | 56.3% | yes |
| 3440 × 1440 | 1440 × 1440 | 41.9% | yes |
| 1080 × 1920 | 1080 × 1080 | 56.3% | yes |
| 2560 × 1440 | 1440 × 1440 | 56.3% | yes |
| 1280 × 720 | 720 × 720 | 56.3% | yes |
| 3840 × 2160 | 2160 × 2160 | 56.3% | yes |
| 1080 × 1350 | 1080 × 1080 | 80% | yes |
| 1920 × 1200 | 1200 × 1200 | 62.5% | yes |
1:1 against other ratios
| Other ratio | Decimal | Share kept or filled | Cropping 1:1 cuts | Padding adds bars |
|---|---|---|---|---|
| 16:9 | 1.778:1 | 56.3% | top and bottom | left and right |
| 9:16 | 1:1.778 | 56.3% | the sides | top and bottom |
| 4:5 | 1:1.25 | 80% | the sides | top and bottom |
| 4:3 | 1.333:1 | 75% | top and bottom | left and right |
| 1.91:1 | 1.91:1 | 52.4% | top and bottom | left and right |
Facts about 1:1
- The smallest 1:1 size is 1 × 1, and every whole width gives a whole height, so square sizes never need rounding.
- Cropping 1:1 to 1.91:1 keeps the least of the common ratios, 52.4%; cropping to 4:5 keeps the most, 80%.
- Of the listed sizes in the crop table, 1080 × 1350 keeps the most when cropped to 1:1 (80%) and 3440 × 1440 the least (41.9%).
Sourced notes
Meta's ads guide asks for Facebook feed carousel cards of at least 1080 × 1080. LinkedIn lists 1200 × 1200 for square single image ads.
Source: Meta Ads Guide: Facebook Feed carousel ads; LinkedIn Help: single image ad specifications. Last verified 2026-10-05.
Check another size
Find the ratio of a size
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Aspect ratio 1:1. Exact match for 1:1.
Aspect ratio
1:1
Exact match for 1:1.
- Width ÷ height
- 1
- Height ÷ width
- 1
- Shape
- square
Your numbers, worked
gcd(1080, 1080) = 1080
1080 ÷ 1080 = 1
1080 ÷ 1080 = 1
1080 ÷ 1080 = 1
Show how the gcd was found
- 1080 = 1 × 1080 + 0
Divide the larger side by the smaller, then divide the last divisor by the remainder until the remainder is 0. The last divisor is the gcd.
What each ratio would cut from 1080 × 1080
The largest centred crop at each ratio, best fit first. Crop rather than stretch.
| Ratio | Fit | Crop to | Lost |
|---|---|---|---|
| 1:1 | Exact | 1080 × 1080 | 0% |
| 5:4 | Trim height | 1080 × 864 | 20% |
| 4:5 | Trim width | 864 × 1080 | 20% |
| 4:3 | Trim height | 1080 × 810 | 25% |
| 3:4 | Trim width | 810 × 1080 | 25% |
| 3:2 | Trim height | 1080 × 720 | 33.3% |
| 2:3 | Trim width | 720 × 1080 | 33.3% |
| 16:10 | Trim height | 1080 × 675 | 37.5% |
| 16:9 | Trim height | 1080 × 608 | 43.7% |
| 9:16 | Trim width | 608 × 1080 | 43.7% |
| 1.91:1 | Trim height | 1080 × 565 | 47.7% |
| 2:1 | Trim height | 1080 × 540 | 50% |
| 21:9 | Trim height | 1080 × 463 | 57.1% |
| 32:9 | Trim height | 1080 × 304 | 71.9% |
Solve the missing side
Pick a ratio, then enter the side you know.
Height is 1080. Size 1080 by 1080 pixels.
Size at 1:1
1080 × 1080
Height solved, in pixels.
Your numbers, worked
H = W × 1 ÷ 1 = 1080 × 1 ÷ 1 = 1080
Whole number, so no rounding is needed.
Pixel-exact: a 1:1 size needs the width to be a multiple of 1, and 1080 is 1080 × 1.
Questions
What sizes are 1:1?
Any size with equal sides is exactly 1:1, such as 1080 × 1080 or 1200 × 1200. Cropping 1920 × 1080 to square keeps 1080 × 1080, 56.3% of the frame.
How do I crop an image to 1:1?
Cut the longer side down to the shorter one and keep the middle. A 1920 × 1080 image becomes 1080 × 1080, and a 1080 × 1920 image becomes 1080 × 1080.
How much of a 1:1 image does a 1.91:1 crop keep?
52.4%. The share kept is the smaller decimal divided by the larger: 1 ÷ 1.91. Padding a 1:1 image to 1.91:1 instead fills the same share of the canvas.
Nearby sizes
Look up a ratio or resolution
Running paid ads on Google or Meta?
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Apart from the sourced notes above, which devices use this ratio, and marketing names for it, are not covered: we did not verify a primary source for them, so this page sticks to arithmetic.