PhotoDeduper

Any computer that has been used for a considerable amount of time is likely to have a significant number of duplicate files taking up storage space. Given the increasing popularity of SSDs, this problem is more important than ever, but it is difficult to find a novice-friendly duplicate cleaner that can help you out.
PhotoDeduper is one such application, an intuitive tool that enables you to find and remove duplicate items in a few simple steps. It features a modern, sleek UI, and can be used even by complete novices.

Easy-to-use duplicate finder that can mark items for deletion automatically

Once you have specified which folders should be searched, the application scans them for duplicate items and sorts these into groups. You can switch between one of the three viewing modes, and then specify which of the identical items should be deleted.
To make things easier, PhotoDeduper offers a helpful Auto Mark tool, which is designed to select items automatically based on a user-defined parameter. For instance, images can be marked for deletion based on their file size, creation date, dimensions and folder.

Suitable for managing large photo collections

This application is a great choice for photographers who need to get rid of identical files that are being stored in several locations, as well pictures saved in multiple resolutions.
It is even possible to exclude files that are too small, as well as expand the search parameters to also include hidden files.
The application supports a wide range of image formats, including JPEG, PNG, BMP, PSD and GIF, as well as numerous RAW formats.

Novice-friendly duplicate cleaner

To sum things up, this is an intuitive, minimalistic application specially designed to help you find and remove duplicate photos. It is very easy to use, and it can mark removable items automatically, while featuring a modern, streamlined UI.