How to identify an aspect ratio
Enter the width and height shown in an image, video, display, or design file. The finder divides both values by their greatest common divisor to preserve the exact proportions.
What the nearest common ratio means
The nearest result compares your exact decimal ratio with familiar formats. Deviation shows the proportional difference, so a close label such as 16:9 does not replace the exact 959:540 result.
Find a ratio from an image
This tool is fastest when you know the dimensions. To inspect a file and then crop or resize it, open the Image Aspect Ratio Calculator.
How the result is checked
The exact ratio is reduced with the greatest common divisor. The nearest common ratio is selected by comparing decimal proportions, so it remains a suggestion unless deviation is 0%. Inputs, limits, and known-ratio comparisons are covered by automated tests.
Frequently asked questions
Is a close common ratio an exact match?
Only when deviation is 0%. Otherwise, use the simplified ratio when exact proportions matter.
Can I use decimal dimensions?
Yes. Values from 1 to 100000 with up to four decimal places are supported.