Md5Checker is a free, faster, lightweight and easy-to-use tool to manage, calculate and verify MD5 checksum of multiple files/folders (Screenshots):

• Calculate and display MD5 checksum of multiple files at one time.
• Use MD5 checksum to fleetly verify whether files have been changed.
• Load, save, add, remove and update MD5 checksum conveniently.
• It is about 300 KB and does not require any installation (portable).