Today I downloaded and tested more than twenty free SHA-1 / MD5 checker software, and picked 3 lightweight, portable, easy to use, and convenient ones from them for you.
We can produce a exclusive 32-digit hexadecimal number from any file, this number can be used as the personal identification number of the file, if two files have the same PIN, then one file is the clone of another, they are identical. The name of the number is called MD5.
1, Quick Checksum Verifier
Quick Checksum Verifier supports drag and drop, it allows you generate and verify MD5( Message Digest Algorithm 5 ) /SHA-1 ( Secure Hash Algorithm 1 ) checksum of any file, it even supports command line.
Quick Checksum Verifier works on Windows 7, Windows XP / Vista / 2000.
2, MD5 & SHA-1 Checksum Utility
MD5 & SHA-1 Checksum Utility allows you drag n drop a file into the textbox and will compute its MD5/SHA1 value instantly. You could copy the MD5/SHA1 checksum with a single button hit.
MD5 & SHA-1 Checksum Utility supports Windows 7, Windows XP / 2008 / 2003 / Vista.
Download it from CNET.
3, KRyLack File Checksum Tool
KRyLack File Checksum Tool supports generating MD5, MD2, SHA-1, SHA-256, SHA-384, SHA-512, HAVAL values of any file, it’s portable and no installation is required.
KRyLack File Checksum Tool is compatible with Windows 7 and Windows XP.