Upload an image to detect its dimensions automatically, or enter width and height manually to calculate its exact ratio and a proportional target size.
Simplified aspect ratio
2048:13651,200 × 800 px preserves this proportion.THE FRAME, REDUCED
Aspect ratio describes shape, not file size. One proportion can travel across storefront cards, social placements, and campaign crops.
THE FIELD NOTES
Use the result now, then read the practical notes for assumptions, examples, limitations, and the choices behind it.
1200 × 800 px after proportional rounding
Upload a photo and the tool reads its real pixel width and height locally, or enter both dimensions manually. It divides the dimensions by their greatest common divisor. For 1920 by 1080, the divisor is 120 and the reduced ratio is 16:9.
To preserve shape, multiply the target width by the original height-to-width ratio. This tool rounds the calculated pixel height to the nearest whole pixel.
Square 1:1 works well for many product grids. Portrait 4:5 is common in social feeds, while 3:2 and 4:3 are familiar camera and editorial shapes.
Matching a ratio does not guarantee enough resolution, correct color, small file size, or a good crop. Enlarging a small image can still look soft.
THE PRODUCT IS NEXT
Upload a photo and the tool reads its real pixel width and height locally, or enter both dimensions manually. It divides the dimensions by their greatest common divisor. For 1920 by 1080, the divisor is 120 and the reduced ratio is 16:9.
Some real image dimensions do not reduce to a familiar small pair. In that case the exact integer ratio may remain large, which is more accurate than forcing it into the nearest standard format.
To preserve shape, multiply the target width by the original height-to-width ratio. This tool rounds the calculated pixel height to the nearest whole pixel.
A one-pixel rounding difference is normal. Cropping, stretching, or independently changing both dimensions alters the composition.
Square 1:1 works well for many product grids. Portrait 4:5 is common in social feeds, while 3:2 and 4:3 are familiar camera and editorial shapes.
Always check the destination’s current requirements. A platform may crop previews even when it accepts the uploaded dimensions.
Matching a ratio does not guarantee enough resolution, correct color, small file size, or a good crop. Enlarging a small image can still look soft.
Use a resizer or editor when you need actual pixel output. This calculator only returns the shape and proportional dimensions.
Aspect ratio is the proportional relationship between an image’s width and height, written as width:height.
No. Your browser reads the image dimensions on your device; the selected image is not sent to a Look Atlas server.
Lock the aspect ratio and change only one target dimension; calculate the other dimension proportionally.
The original integer dimensions may share only a small divisor. A large exact ratio is preferable to an inaccurate familiar label.
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