Rapid File Renamer is used to rename files. However, you may ask the question why use Rapid File Renamer when you can rename files manually? Of course, if you need to rename one or two dozens files, then you can rename files manually with a little time and effort. But what if you have hundreds and thousands of files to rename? Then you cannot do without Rapid File Renamer as it allows you to easily rename a large number of files in seconds.