Recently I found a site that lets you take one image and create 70+ different backgrounds and layouts in about 10 seconds. This week a similar tool, the Biteable Image Resizer, lets you resize images for social media within about 10 seconds.
This is so easy to do that I managed it on my phone during coffee this morning.
How to resize images for social media in three steps
Step One: Upload Your Image
Drag or choose from phone or computer.

Step Two: Choose Focus Point
Move the circle around the area you want to be the focal point of each image no matter the size.

Step Three: Download Sizes
You can choose the social media size you want or just click one button to download all the images in a folder. The images will arrive organized and labeled so you don’t have to guess which size is best.