Potato Hash is a simple utility application that allows you to MD5 hash arbitrary strings.
Potato Hash also allows you to conveniently reverse MD5 hashes using an online MD5 reversal service.
Should you choose to, you can share your MD5 hashing results to the MD5 reversal service, helping to improve it.
You can use this application to exercise your curiosity and to check whether your passwords may be reversible!
Good account systems shouldn't use MD5 hashing as a way of securing passwords, but some do, so why not be cautious?