Encrypto is a free, easy-to-use app that lets you encrypt files with AES-256 encryption and then send them to friends or coworkers. It works on both Mac and Windows, so you can send encrypted files without worrying whether the other person can open it or not. Protect Files with AES-256 Encryption Take any file or folder and add AES-256 encryption to it. Let Encrypto give you peace of mind when it comes to the security of your files when sending them. Send Password Hints Instead of relaying a password, include a unique, embedded password hint that only the recipient would be able to decipher. Send Files Using OS X Sharing Share encrypted files via Mail, AirDrop, or Messages, or even share them with third-party apps like Dropbox. However you usually share, Encrypto has you covered. Or Save Them to Disk With Encrypto, you can encrypt your files even if you don’t need to send them. You know, for file security on your hard drive. Just put your file through Encrypto and boom — it’s protected. Encrypt and Decrypt on Both Mac and Windows Share files with friends no matter their OS. You use a Mac, your friend uses Windows — you both can encrypt and send files to each other with Encrypto.