VeraCrypt

VeraCrypt is another useful file encryption program that can be downloaded for free on Windows, OS X, and Linux. TrueCrypt's branch and successor is VeraCrypt. In addition to TwoFish and Serpent, it generally encrypts data with AES. Apart from file encryption, VeraCrypt can also construct a virtual encrypted disk in a file or encrypt the partition or (in Windows) the whole storage device using pre-boot authentication.

VeraCrypt's fans hail it as an immediate encryption tool since your data are only decrypted when they're needed, and they've encrypted the rest of the time. Nonetheless, many individuals claim that, despite its lack of a nice-looking interface, it is still a strong and simple-to-use tool. VeraCrypt may not support TrueCrypt files and containers, but it can convert them to its own format, as you've discovered. Its development staff works tirelessly to improve the user experience and make it more useful.