Mass File Renamer

Keeping your files organized isn't easy when you have to deal with large amounts of information. In this case, you can resort to a batch file renamer that offers to quickly sort your items based on the rules you specify.
Such a tool is Mass File Renamer, a small-sized application capable of renaming many files in bulk, regardless of their format, by replacing, removing or adding new characters.

Rename multiple files at the same time

The file renaming app is packed in a single .exe file that can be copied anywhere on the computer and just double-clicked to launch the program. Also, you can keep it stored on a thumb drive to effortlessly launch Mass File Renamer on any PC.
Note that it's not entirely portable because it depends on .NET Framework to work properly, so make sure you have this software framework installed.

Add files to the task list

As far as the GUI goes, the batch renamer has one window with a neatly organized layout, showing all options put at your disposal.
You can get started by populating the task list with the files you want to rename. This can be done by using the popup file browser to navigate disk directories as well as select and open multiple files at once.
Worth noting is that any new files you later add will automatically replace the ones in the task list, which means that the items must exist in the same folder to be able to add them to the job list.

Replace, remove or add new characters

When it comes to the file renaming mode, you can instruct the tool to find and replace strings of characters, remove them, or append new ones as suffixes. The modifications will be applied right after clicking "Execute".

Cannot preview the new file names

Unfortunately, Mass File Renamer doesn't give you the possibility to preview the new names. Therefore, you might end up not liking the results but have no option to undo the changes and try again.
On top of that, an error popped up in our tests whenever we attempted to remove characters. We must also keep in mind that the software project hasn't been updated for a long time and it doesn't seem to be in development anymore.