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Trezor Extends Maximum Passphrase Length to 128 Characters

Trezor Extends Maximum Passphrase Length to 128 Characters

Forklog • November 2, 2026

In a recent update, Trezor Suite developers have increased the passphrase limit from 50 to 128 characters. This passphrase complements the seed phrase and opens a separate wallet with its own addresses and balance. To use the new limit, users must update their device firmware.

The company highlighted attacks on Coldcard: due to a firmware error, some devices generated seed phrases with insufficient randomness, allowing attackers to recover them. According to Trezor, strong unique passphrases helped some users protect their funds.

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