Password Generator

What is a password generator and why use it?

A password generator creates passwords from truly random characters instead of words and patterns that people choose. Human-made passwords tend to be short, reused and predictable, which is how most accounts get broken into.

This generator uses your browser's built-in cryptographic random number generator. The password is created on your device, is never sent anywhere and is never stored, so only you ever see it.

How to use this tool

1. 1

   Set the length

   Drag the slider from 4 to 64 characters. Aim for at least 16 for important accounts.

2. 2

   Choose characters

   Tick uppercase, lowercase, numbers and symbols. At least one type must stay selected.

3. 3

   Copy the password

   A new password appears each time you change an option. Press Generate new for another one, then Copy password. Store it in a password manager.

How password strength is estimated

Strength is measured in bits of entropy: the length multiplied by log2 of the number of possible characters. Each extra bit doubles the number of guesses an attacker needs. Length matters more than complexity, since every added character multiplies the possibilities.

As a guide, below 40 bits is weak, 60 bits resists most online attacks, and 90 bits or more is very strong. A 16-character password using all four character types has about 100 bits.

FAQ