Popular multi-platform freeware utility HJSplit has been the numero-uno software for splitting and joining files but a better alternative might soon change this, As the name suggests FSSJ - The Fastest File Splitter and Joiner is an fast and efficient free file splitter and joiner for Windows with added smart features like option to delete split parts after joining, password protected file splits, support for file join and split operations from context menu and MD5 checksum integration to verify data integrity.