Strong random passwords and easy-to-type passphrases, generated with your browser's cryptographic randomness. Nothing is transmitted, logged, or stored.
A generator is a band-aid — the real fix is a password manager, so every account gets a unique password you never have to remember. Passphrases (four random words) are the best choice for the handful of passwords you must type by hand, like your computer login. And turn on multi-factor authentication everywhere it's offered.
More free tools that respect your data: bvtech.org/tools.