You cannot "crack" the server. To get Synthesia for free, a hacker would need to breach Synthesia’s secure servers and grant themselves access, which is a major federal crime (hacking), not just software piracy. Therefore, almost every download claiming to be a "Synthesia Unlock Key" is a scam or a virus, because technically, it is impossible to unlock server-side resources via a client-side key.

The newer Synthesia AI Video Generator creates videos with AI avatars from text.