A checksum is a string of characters which uniquely identifies afile, a digital fingerprint. Change even a few bytes of a file–forexample, by infecting it with a virus or replacing an old ...

Free File Integrity Checkers & Checksum Integrity verifier tools to check file integrity of downloaded files in Windows using MD5 & SHA1 cryptographic hashes for files.

PS Hash calculates checksum & hashes of files The idea behind it is to calculate file hashes and checksums and then compare their contents using a specialized algorithm.