If you save the optimized image with same extension in the same path the program will overwrite the file.
Obviously you can add suffix/prefix but it should ask you anyway if you want to overwrite the original file or change the name by default to don't lose the original file.
If you save the optimized image with same extension in the same path the program will overwrite the file.
Obviously you can add suffix/prefix but it should ask you anyway if you want to overwrite the original file or change the name by default to don't lose the original file.