1280x1024 aspect ratio: 5:4 (1.25:1)
1280 × 1024 reduces to 5:4. The greatest common divisor of 1280 and 1024 is 256, so 1280 ÷ 256 = 5 and 1024 ÷ 256 = 4. That is exactly 5:4.
Published · Updated
At a glance
5:4
1280 × 1024 is exactly 5:4.
- Decimal
- 1.25:1
- Nearest named ratio
- 5:4, exact
- Orientation
- Landscape
- Pixels
- 1,310,720
- Megapixels
- 1.31
- Greatest common divisor
- 256
How 1280 × 1024 reduces
- 1280 = 1 × 1024 + 256
- 1024 = 4 × 256 + 0
The last divisor, 256, is the greatest common divisor, so 1280 × 1024 reduces to 5:4. The method by hand is on the calculator page.
Crop or pad 1280 × 1024 to common ratios
Whole-pixel downscales
| Divide by | Size | Whole pixels | Nearest whole size |
|---|---|---|---|
| ÷2 | 640 × 512 | yes | same |
| ÷3 | 426.67 × 341.33 | no | 427 × 341, 0.18% off 5:4 |
| ÷4 | 320 × 256 | yes | same |
| ÷5 | 256 × 204.80 | no | 256 × 205, 0.098% off 5:4 |
| ÷6 | 213.33 × 170.67 | no | 213 × 171, 0.35% off 5:4 |
| ÷8 | 160 × 128 | yes | same |
| ÷10 | 128 × 102.40 | no | 128 × 102, 0.39% off 5:4 |
Nearest listed ratios
| Size | Reduced ratio | Decimal | Difference from 1280 × 1024 |
|---|---|---|---|
| 1280 × 1024this page's size | 5:4 | 1.25:1 | - |
| 1440 × 1080 | 4:3 | 1.333:1 | 6.67% |
| 1920 × 1200 | 8:5 | 1.6:1 | 28% |
| 1360 × 768 | 85:48 | 1.771:1 | 41.7% |
Facts about 1280 × 1024
- 1280 × 1024 is exactly 5:4: 256 × 5 by 256 × 4.
- 1280 × 1024 divides into whole pixels by 2, 4 and 8; ÷3 gives 426.67 × 341.33, which is not whole pixels.
- Turned on its side, 1280 × 1024 becomes 1024 × 1280 (4:5).
- Cropped to 9:16, 1280 × 1024 keeps 45% (576 × 1024); cropped to 1:1 it keeps 80% (1024 × 1024).
- 1280 × 1024 is 1,310,720 pixels (1.31 MP), 0.63 times the pixel count of 1920 × 1080.
Check another size
Find the ratio of a size
Type a width and height in pixels.
The size is read in your browser; the file is never uploaded.
Aspect ratio 5:4 (1.25:1). Exact match for 5:4.
Aspect ratio
5:4
1.25:1
Exact match for 5:4.
- Width ÷ height
- 1.25
- Height ÷ width
- 0.8
- Shape
- landscape
Your numbers, worked
gcd(1280, 1024) = 256
1280 ÷ 256 = 5
1024 ÷ 256 = 4
1280 ÷ 1024 = 1.25
Show how the gcd was found
- 1280 = 1 × 1024 + 256
- 1024 = 4 × 256 + 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 1280 × 1024
The largest centred crop at each ratio, best fit first. Crop rather than stretch.
| Ratio | Fit | Crop to | Lost |
|---|---|---|---|
| 5:4 | Exact | 1280 × 1024 | 0% |
| 4:3 | Trim height | 1280 × 960 | 6.25% |
| 3:2 | Trim height | 1280 × 853 | 16.7% |
| 1:1 | Trim width | 1024 × 1024 | 20% |
| 16:10 | Trim height | 1280 × 800 | 21.9% |
| 16:9 | Trim height | 1280 × 720 | 29.7% |
| 1.91:1 | Trim height | 1280 × 670 | 34.6% |
| 4:5 | Trim width | 819 × 1024 | 36% |
| 2:1 | Trim height | 1280 × 640 | 37.5% |
| 3:4 | Trim width | 768 × 1024 | 40% |
| 21:9 | Trim height | 1280 × 549 | 46.4% |
| 2:3 | Trim width | 683 × 1024 | 46.6% |
| 9:16 | Trim width | 576 × 1024 | 55% |
| 32:9 | Trim height | 1280 × 360 | 64.8% |
Solve the missing side
Pick a ratio, then enter the side you know.
Height is 1024. Size 1280 by 1024 pixels.
Size at 5:4
1280 × 1024
Height solved, in pixels.
Your numbers, worked
H = W × 4 ÷ 5 = 1280 × 4 ÷ 5 = 1024
Whole number, so no rounding is needed.
Pixel-exact: a 5:4 size needs the width to be a multiple of 5, and 1280 is 256 × 5.
Questions
What aspect ratio is 1280x1024?
1280 × 1024 is 5:4 (1.25:1). Dividing both sides by their greatest common divisor, 256, gives 5 and 4. That is exactly 5:4.
How do I resize 1280x1024 without distortion?
Keep the ratio at 5:4: new height = new width × 4 ÷ 5. Dividing both sides by 2, 4 or 8 keeps whole pixels, for example 160 × 128 at ÷8.
What is 1280x1024 cropped to 9:16?
A centered 9:16 crop of 1280 × 1024 is 576 × 1024, which keeps 45% of the image. Padding it to 9:16 instead gives a 1280 × 2276 canvas with 1,252 px of bars. That canvas is rounded, not exactly 9:16: the exact padded side would be 2275.56 px tall. The smallest exact 9:16 canvas around it is 1287 × 2288.
Nearby sizes
Look up a ratio or resolution
Running paid ads on Google or Meta?
AdFlint writes and launches Google Ads and Meta campaigns from an ad account you own, and generates ad images at fixed sizes such as 1080 × 1080, 1080 × 1920 and 1200 × 628. Nothing runs until you approve it. Self-serve plans start at $40 a month, with a 7-day free trial on monthly plans (card required).
Which devices use this size, and marketing names for it, are not covered: we did not verify a primary source for them, so this page sticks to arithmetic.