FastStone Image Viewer is a powerful, stable, user-friendly image browser, converter and editor. It allows you to edit photos freely. This program has a nice array of features that include image viewing, management, comparison, red-eye removal, emailing, resizing, cropping and color adjustments. It can also help you to compare images easily. Here is the instruction.
1. Run FastStone Image Viewer.
2. Select your images. Click on the Comparator button to go to a 100% view window.
3. Compare the image’s histograms and Exif information.
4. Here are the options for you to operate:
Zoom in and out
View at Full Screen
Copy to Folder
Move to Folder
5. Move your images to compare the details.