This software enables you to calculate MD-5 and SHA-1 checksums very easily:
Drag-and-drop any file to the "file"-textfield, or
use the "open" button to choose a file manually
call it from the command-line: java -jar md5-checker-0.9.5.jar file
or use the comprehensive batch mode!
If a corresponding .md5 file exists, the correctness of the file checksum is checked automatically. If your .md5 file resides in another directory, just use the drag-and-drop capability of your platform to drop it on the checksum textfield. You'll be notified on the outcome.
If you like, you may copy the calculated checksum to the clipboard for later use by clicking the "copy" button.