iside compares files and folders by computing their hash code (md5,sha1,crc32,...). right click on a file, select copy and by right clicking on another file you will discover if the two files are equal. includes file comparison, hash generating tool plus a complete folder comparison tool. the hash function is the fingerprint of file. it allows to determine if two files are different even if their size is the same. ideal tool for configuration managers, programmers, deployers. useful also to compare photos, music and movies downloaded from internet. it can also be used for file integrity checking.