ImageDownloader

It is easy enough to save individual images from the web, but downloading large numbers of files is quite a bit more difficult. Thankfully, you can take advantage of dedicated desktop apps that make the process a lot simpler.
ImageDownloader is a compact application designed to help you grab images from Reddit and Imgur, as well as transfer files between local directories. It is fairly easy to use, and it lets you filter images based on several parameters, but it does look a bit unpolished.

Download images from Reddit and Imgur

In order to grab images from Reddit, you need to provide the name of a subreddit, specify where files should be saved and, optionally, set up a number of filters. You can pull content from the main page, Top, New, Rising and Controversial, and the maximum number of posts to be saved can be limited.
It is also possible to download entire Imgur albums in an effortless manner, and the program allows you to filter images based on their dimensions and aspect ratio.

Transfer filtered files between local folders

Despite what its name suggests, ImageDownloader is not limited to grabbing content from the web, as it also allows you to copy files from one folder to another based on their resolution and aspect ratio.
The application lacks more advanced filters, however, so it may not be the best tool for local transfers. Nevertheless, it is simple to use and should be suitable for smaller operations.

Lightweight utility that features a simplistic, practical UI

It takes one look to understand that the developer’s main concern was functionality rather than looks, as the application features a very plain UI.
Thankfully, though, the program can be deployed easily because of its small file size, and there is no need to install anything on your PC beforehand.
In conclusion, ImageDownloader is a no-nonsense tool that enables you to grab pictures from Reddit and Imgur, as well as transfer files locally. It is not exactly groundbreaking, and it looks somewhat outdated, but it can get the job done.