2. Click the "Add File(s)" button to add files. Then an open file dialog will appear, hold CTRL or SHIFT key to select multiple files. To add all files in a folder, click "Add All Files in Folder" then select a folder.
3. Choose an option such as "Remove All Spaces In Filenames", "Change case to upper, lower, proper (title) or sentence case", "Remove alpha, numeric, alpha-numeric or non-alpha-numeric", etc.
4. To start renaming the selected files, click the "Rename" button.