About this tool
Enter a width and height to get the simplified aspect ratio (for example 1920×1080 becomes 16:9). Then scale to a new width or height and the matching dimension is filled in automatically to preserve the ratio — all in your browser.
Frequently asked questions
How is the ratio simplified?
Both numbers are divided by their greatest common divisor, so 1920×1080 reduces to 16:9.
How does scaling work?
Type a new width and the height is computed to keep the same ratio, and vice-versa, so resized dimensions never distort.