Is there a character limit for an encryption password when formatting a USB drive as Mac OS Extended (Journaled, Encrypted) in Disk Utility? I was able to use a very long 65-character password but was wondering how much longer I can make it.


1 Answer 1


FileVault 2, uses the User's login password as the encryption passphrase.1 macOS/OS X doesn't have a limit as to the length of a password2.

You can have a password without a limit, but practically speaking, it's not feasible to do so.

1 https://en.wikipedia.org/wiki/FileVault#Security

2 https://security.stackexchange.com/questions/22721/password-length-limits-in-history-of-operating-systems-and-popular-web-sites

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