FCompare

FCompare is a feather-light and portable software application capable of comparing any two files by size to find out if they are identical. It doesn't include any complex options or configuration settings, making it accessible to all types of users, even those inexperienced with such apps.

Since there is no installation involved, you can save the executable file in a custom location on the HDD and double-click it to launch the program. Another possibility is to keep it stored on a USB flash drive, in order to directly run it on any PC with minimum effort and no previous installers. It doesn't make any changes to the Windows registry settings.

As far as the interface goes, FCompare adopts a small window that shows all options provided by the tool, enabling you to select two distinct files to compare using the file browser or drag-and-drop support. It's not possible to verify more than two files at the same time.

The task is initialized easily and should be over quickly, depending on the size of your files. In the following step, the utility shows a notification message to let you know if the two files are identical or different.

You can make the main app window stay on top of other running processes, as well as place it on the center of the screen with a single click from the menu bar.

Unsurprisingly, it left a small footprint on system performance in our tests, thanks to the fact that it required low CPU and RAM. No error dialogs popped up and it didn't hang or crash. On the other hand, FCompare has limited features to offer, especially for advanced users looking for additional settings.