Image Resize is a free photo utility app that was designed to allow you to instantly and easily resize any number of images all at once. You can select images from a number of sources, like any connected storage devices or the local gallery on your mobile device. Images can be selected in batches if you want to resize all of them to the same configuration, and you can also perform single photo resizes by only selecting the one photo to be resized.

There are some downsides to the software, and the user interface could be a bit easier to understand. The app is also supported by ads, so even though it is technically free, you'll be constantly bombarded with advertisements. Of course, the app is also small and lightweight, and it uses almost no system resources, so if you are in constant need of image resizing, it might not be a bad option. There are also other options out there that provide even more editing options, but those might be unnecessary if you only need to resize the images in question. This might the case for a photographer or someone responsible for consolidating stored data by making saved images smaller.