Batch Resize is the best app for batching photos and resizing them at once. It supports both portrait and landscape pictures and includes a range of resizing modes, such as fixed width (Proportional height) and fixed height (Proportional width). The most useful aspect of Batch Resize is that it supports both PNG and JPEG formats and therefore gives you a great option for how you want to save your photos.

When you use Batch Resize you can resize your photos to the desired size and it's going to be saved directly into your Pictures folder. The main difference from other applications is that it's very easy to use and is very effective in your work.