CKRename

CKRename is a batch file renaming tool that lets you change the name of multiple files at the same time based on user-defined rules.
The interface is very clean and well-organized, which makes the whole application very easy to use, so the whole renaming process shouldn't take more than a minute.
With a multi-panel look that lets you browse local folders, view the existing file names and preview the new file name, CKRename is aimed at beginners and more advanced users alike, with multiple options to configure renaming.
For example, you can change file name and insert before or after the initial name tag a special character, of even auto number the files, change or remove extension. Obviously, you can change the case as well, with multiple options such as upper, lower and first or set up string substitution to replace a given character automatically.
One of the good things about CKRename is the fact that the file name preview window works in real-time, which means you can see the new file names as you set up new rules in the bottom of the main window.
The program can also save the settings before exiting, so the next time you launch it you can use the same renaming options for a new batch of files.
The file renaming process takes just a few seconds and everything works quite smooth, no matter the Windows version you are using.
All in all, CKRename is indeed a very handy software solution and with a few improvements here and there it could easily become a top product when it comes to renaming multiple files on the go.