Is this password generated securely?
Yes — it uses your browser's built-in cryptographically secure random number generator (the same one used for encryption keys), not a predictable pseudo-random function.
Why exclude ambiguous characters?
Characters like l, I, 1, O, and 0 can look identical in some fonts — excluding them avoids transcription mistakes when typing the password manually.
Is the generated password stored or sent anywhere?
No. It's generated and displayed entirely in your browser and disappears when you close or refresh the page unless you copy it.