Aspect Ratio Calculator
Make sure that your images are the right size.
Aspect Ratio is critical to making sure that your image looks good no matter how it displays. The 16:9 format is the most common format for images on the web.
One way to know that your using the right ratio size is the Aspect Calculator. It's a simple tool that can help make sure that your blog or social media post will look good.
Website Description
This little tool will help you calculate aspect ratios and dimensions for your videos or images. This can also be used to check if you are working at the correct resolution.
Aspect Ratio of 16:9 ("Sixteen-by-Nine" and "Sixteen-to-Nine") which is also known as High Definition (HD) became a leading aspect ratio since the start of the 21st century. It is the international standard format of HDTV, non-HD digital television and analog widescreen television PALplus. Today many digital video cameras have the capability to record in High Definition format, and it is the only widescreen aspect ratio natively supported by the DVD standard.
https://aspectratiocalculator.com/16-9.html