Hi, thanks for messaging. Sending files to a 3rd party Internet service always carries some risk, but we've built the Zamzar website with security as a top priority. All of our hardware runs in world-class, highly secure data centres utilising state-of-the art electronic surveillance and multi-factor access control systems. All traffic to and from our servers is secured by transport-level security using 128 bit SSL to encrypt the data sent between your systems and ours. Additionally, if you have a Zamzar (paid) account you can also use your personal inbox to delete converted files so that you have confidence they are permanently removed from our systems. We hope that helps! Thanks, the Zamzar team.