The more business profiles you have in different social networks, the more time should be spent on their administration and management. Each social network has its own requirements for the image sizes that can be published there. Accordingly – the more sizes for the image should be created, the more time consuming and expensive it is. For example, if the picture is prepared in the size as required by Pinterest, it may happen that Twitter “cuts” the top and the bottom of it together with an important text or illustration.
The Internet is full of various infographics and descriptions, which list all image sizes necessary for different social networks. In reality, there are only two sizes that are important: square and portrait.
Square: 1200 x 1200 px (suitable for Facebook, Twitter, LinkedIn and Instagram)
Portrait: 800 x 1200 px (suitable for Google+ and Pinterest)
Depending on which social networks you need to prepare your images for, you can probably get along with just one size, which would look good everywhere (un-deformed and of good quality).
In case you have created an image that should be adapted for a different size, for example, to a website or a blog image size limitations, this is a convenient tool, which can easily figure out the new size while maintaining its aspect ratio.