Password Generator

At least 16 characters for important accounts. A random 16-character password using all character types has about 104 bits of entropy — far beyond what anyone can brute-force.

How many guesses an attacker would need, as a power of two: 80 bits means 2^80 possibilities. It's the right measure for generated passwords because the attacker is assumed to know exactly how they were made.

No — use a password manager to store a different random password for every site. For the few you must remember (like the manager's own), use a passphrase instead.

No. Everything is generated and processed in your browser with its built-in cryptography. Nothing you type or generate is uploaded, logged, or stored.