What is a good, free way to scale a large batch of images down? They are of different sizes with the same aspect ratio. The target size is all going to be the same dimensions.
There are many programs that can accomplish the task of rescaling a large batch of images. Finding a good one for you depends on the details of your environment. Let's start with getting a little more information. What kind of device are you using? For instance, are you using a Windows PC, an iPhone, a Linux server, or something else?