Remove Duplicates

Remove Duplicates is a small-sized tool that compares the email addresses from two distinct files, removes the duplicates, and gives you the possibility to save the results to a new plain text document. In this case, a duplicate mail address means that the same entry appears in both files.

Prerequisites and interface

The application's packed in a single .exe file that can be saved to a custom directory on the disk or stored on a removable storage unit, in order to seamlessly run it on any PC. However, you must have .NET Framework installed. It doesn't create files on the disk without your permission or add new entries to the system registry.
The interface is represented by a standard .NET Framework form that doesn't put emphasis on graphical elements, yet it's easy to navigate.

How it works

After opening the two text documents with email addresses (one per line), you can view their contents and click a button to quickly eliminate the duplicate entries after cross-checking the files.
Worth noting is that only the items from the first list which also exist in the second one are removed. This means that the distinct email addresses from the first list are preserved, while the remaining ones from the second list are ignored (not displayed in the results panel).
The results are shown on the bottom part of the window. Moreover, the utility reveals the total removed duplicates, along with the new list count. This new list can be saved to a new text document by indicating the output directory and filename. Existing files are not automatically overwritten, as the tool asks for confirmation.

Evaluation and conclusion

It's a bit tricky to figure out how Remove Duplicates works. This may require you to experiment with several files before using it to get rid of duplicate email addresses when it comes to important information. CPU and RAM usage was minimal in our tests.