What Is an Aspect Ratio?
An image’s aspect ratio is the proportional relationship of the width to the height. The formula is width:height or w:h. We see the aspect ratio as two numbers separated by a colon, like 1:1.
Let’s look at the aspect ratio of an image. A 6 × 4 inch image has an aspect ratio of 3:2, whereas a 1000 × 1000 inch square image has an aspect ratio of 1:1.
An aspect ratio does not have units attached—instead, it represents how large the width is compared to the height. This means that an image measured in centimeters will have the same aspect ratio, even if measured in inches.
The relationship between its width and height determines the aspect ratio and shape, but not the image’s actual size.
Aspect ratios are critical in content creation. We need to upload images at different aspect ratios for different uses, like desktop vs. mobile or blog vs. social media.
When you use the right aspect ratios, your images or videos are displayed as intended without stretching or loss of resolution. Having an incorrect aspect ratio for your project can affect the end-user experience.
Let’s go over some common aspect ratios, then look at image sizing and a tool that makes resizing images easier.
Common Image Aspect Ratios
Different aspect ratios affect a single image in different ways. An image set in a 1:1 ratio vs. a 5:4 ratio changes the composition and how we view the photo.
For example, the image below is in a square format with a 1:1 aspect ratio—typical of social media profile pictures or Instagram feed photos. The square image is distinct from the same image framed in a 5:4 ratio.
The background in the 5:4 ratio takes up more space around the subject, placing the subject towards the bottom-left corner. It is crucial to keep the overall composition in mind when selecting an image aspect ratio.
Next, let’s review the most common aspect ratios for images.