Photopus is a photo editing app that offers many options for adjusting, cleaning up, and adding effects to your photos. It contains a variety of filters and other tools that let you create sharp and distinct images, change the orientation of the image, and alter the border shape and size. The interface is uncomplicated and presents the general steps of the photo editing process in a clear manner.
The first step once you open the app is to add photos. You can add single images or import them in batches. Any photos you import at once will be adjusted together. That means that any changes you make to the image you're looking at will be applied to all of the images in the batch. This can be an efficient way to make some generic changes to multiple photos at once, but since you're only looking at one photo even though you're changing all of them, it's hard to know how each change will impact the photos you can't see.
You can review the changes to each image by selecting it from the drop-down menu below the image, and you can then make additional changes; but it is a bit of a cumbersome process. If you're only working on one photo at a time, though, this wouldn't be an issue. Overall, this app provides what it promises, but there are other free apps that do it better.