MD5/CRC32 Checksum

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An MD5 checksum is a unique 32-character signature (or hash) of a file. It's statistically impossible for two non-identical files to have the same signature. Some download sites publish the MD5 hash of their files, letting you compare the result after downloading to ensure the file you have is identical. You can use this shell extension to do that, or to determine the MD5 hash of files you're uploading.

A similar system is the CRC32, or Cyclic Redundancy Check, and this tool will also calculate the CRC for a file. For CRCs, you can choose to display the result in decimal or hex format – ShellToys remembers your display choice for next time.