winMd5Sum Portable is easy to use, installs quickly and it's portable.

winMd5Sum Portable makes it easy to verify that the files you download are unaltered when on the go. Simply drag and drop a file to the window and it will calculate the Md5 sum in seconds.

You can even copy and paste the published md5 sum into the compare box to quickly compare it. PortableApps.com publishes the md5 sums for all its apps, so you can easily ensure that you have the real deal.

What's an MD5 Sum? An MD5 sum is a cryptographic hash used to verify the integrity of files. So, when you download a file, you can check what the publisher says the MD5 sum is and compare it to the MD5 sum of the file you have

You obtain the MD5 checksum of a file by
· Browse for it
· Drag and drop the file on winMd5Sum's main window
· Send the file using the SendTo menu
· Pass that file as command line paramater