This little utility calculates the MD5 sum of the input in the text box above Md5 is a one way hash, which is used to check against changes in various documents, files ets. Be aware that every single byte change will affect the MD5 sum, sp even a space or an extra linebreak will affect the ND5 sum. Since the utility is primarly made to webservice, it only returns the MD5 atring. No HTML, just a plain text string. Wikipedias description can be found here.