The aspect ratio of a rectangle is the ratio of the length of the longer side to the length of the shorter side. For displays and images the aspect ratio is the ratio of width to height, for example, 16:9 or 2.35:1.. How to Change Image Aspect Ratio Online 1 Upload the image you want to change. 2 Select a predefined aspect ratio (like 16:9, 4:3, 1:1) or enter custom values. 3 Adjust the crop box to frame your image perfectly within the new ratio. 4 Click 'Download' to save your image with the new aspect ratio.
![The Ultimate Aspect Ratio Guide [with FREE Aspect Ratio Calculator]](https://s.studiobinder.com/wp-content/uploads/2018/12/Aspect-Ratio-Definition-Movie-Image-Aspect-Ratio-Examples.jpg "The Ultimate Aspect Ratio Guide [with FREE Aspect Ratio Calculator]")
Aspect ratio (image) The aspect ratio of an image is the ratio of its width to its height. It is expressed as two numbers separated by a colon, in the format width:height. Common aspect ratios are 1.85:1 and 2.39:1 in cinematography, 4:3 (originally) and 16:9 in television, and 3:2 in still photography.. In 2013 the 2.00:1 ratio also known as the 2:1 or even 18:9 aspect ratio became a very common format on TV. It falls right in-between the common 16:9 and classic widescreen aspect ratio.