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Generate a strong, random password using your browser's cryptographically secure random number generator — nothing is sent over the network.
The strength estimate below is based on entropy: the length of the password multiplied by how large the character set is. A longer password drawn from a bigger set of possible characters takes exponentially longer to guess by brute force. Mixing character types matters less than length — a 20-character password using only lowercase letters is often stronger than an 8-character password using everything.
getRandomValues, a cryptographically secure random source, not a simple pseudo-random function.