Why password strength matters
Weak passwords are behind the majority of account breaches. This free password strength checker estimates how long it would take a modern attacker to crack your password using its entropy — a mathematical measure of unpredictability. The higher the bits of entropy, the exponentially harder it is to guess.
How to create a strong password
Aim for at least 12–16 characters mixing uppercase, lowercase, numbers, and symbols — or better still, use a long passphrase of random words. Never reuse passwords across sites. For the safest approach, pair this tool with a password manager (see our best password manager guide).
Is this password checker safe?
Completely. Every calculation runs locally in your browser using JavaScript. Your password is never transmitted, logged, or stored on any server. You can even disconnect from the internet and it still works.