How to use the password generator
Move the slider to choose a length, tick the character types the website accepts, and press Generate. Press Copy to put the password on your clipboard, then paste it into the sign-up form and save it in your password manager. If you have to type the password by hand on another device, switch on “Avoid look-alikes” to remove characters that are easy to confuse.
How the passwords are created
Each character is picked independently and uniformly from the selected character pool using your browser’s secure random number generator, with rejection sampling so that no character is more likely than another. At least one character from every selected type is guaranteed, and the final order is shuffled with the same secure source.
What the strength estimate means
Strength is shown as bits of entropy: length × log2(pool size). A 16-character password using all four character types draws from about 90 characters, giving roughly 104 bits, far beyond what can be brute-forced today. The estimate only holds for randomly generated passwords; a human-chosen password of the same length is much weaker.