This area of the program allows you to change the naming structure of the files when they are converted.

Renaming Options

Choose the naming scheme of your selected image file(s).
Rename file(s) as follows: Choose the filename of the output image file(s). Default is "filename" + 2-Digit Numbers. (i.e. filename01.jpg) You can choose numbers, letter or dates.
Do Not Rename file(s): Does not rename the image files.
File Name Case: Either No Change, or change the filename(s) to lowercase or UPPERCASE.
Destination Folder Options

Choose the output directory of your selected image file(s).
Same Folder: Will output the image file(s) into their current directory.
Specified Folder: Choose a folder location where you want the select image file(s) to be saved. If you don't already have a folder created where you want this files to be saved, use the "Create Folder" button to create it.
If Destination File Exists: This determines if the file will be overwritten or skipped if the filename already exists.
Skip: If the filename already exist, it will not be overwritten
Overwrite: If the file name already exist, it will be overwritten.
Overwrite unless original: This option will overwrite the file only if it isn't the original file.
Example: If you are converting an image called picture.jpg, in the directory "C:\My Pictures" and you choose to convert it and save the output file as "C:\My Pictures\picture.jpg" it won't overwrite it, because you are trying to overwrite the original image. If you choose to save the output file as "C:\My Pictures\oldpictures\picture.jpg" it will save it, even if another picture.jpg already exists in that directory because it's not the original image you are converting.