Choose length before complexity
For most accounts, a longer unique password is more useful than a short password packed with substitutions. Start with at least 16 characters unless the service imposes a different limit. If a site rejects symbols, turn them off and add length instead.
How the generator chooses characters
The tool uses crypto.getRandomValues(), the secure random-number source provided by modern browsers. Selected character groups form the available alphabet, and every position is chosen independently. Generation happens on this page; the result is not sent to thisuseful.
What to do with the result
Save the password directly in a reputable password manager. Do not reuse it, email it to yourself, or keep it in an unencrypted note. For a password manager’s main password, consider a memorable multi-word passphrase instead of storing another random value you cannot recover.