The first thing you need to do when using Image Comparer is to select the type of files you want to compare. 

In the end, you have to decide whether you want to find similar images or exact duplicates. 

This window will appear on your screen when the images are added to the gallery and are being processed by the application. 

The result will be displayed in image pairs, so that you can analyze every pair and decide which image you will remove. 

The Preferences window enables you to adjust the thumbnails width and height, and also the maximum number of images that can be displayed as thumbnails. 

Depending on your specific requirements, you can change the similarity threshold up to 100%, when you will find only the exact duplicates.