How strong is your password?

A password strength checker analyses several factors including length, character variety, and whether the password appears in lists of commonly used or previously leaked passwords. Our password strength checker calculates an estimated time to crack based on these factors, helping you understand how vulnerable a given password would be against automated attacks.

No. This password strength checker runs entirely in your browser using local JavaScript. Your password is never transmitted over the internet, stored, or logged anywhere, making it completely safe to test your real passwords here rather than a placeholder.

Length is generally the most important factor a password strength checker measures, followed by the variety of characters used, including uppercase letters, lowercase letters, numbers, and symbols. Avoiding common passwords, dictionary words, and personal information such as names or birthdays also significantly improves strength. If you’d also like to check whether a password has already been exposed in a data breach, try our password breach checker.

Every additional character in a password multiplies the number of possible combinations an attacker would need to try, which is why length has such an outsized effect on password strength. A long passphrase made of ordinary words is often stronger and more memorable than a short, complex string of random symbols. Current security guidance increasingly treats length as one of the most important factors in password strength.

Testing important passwords, particularly for email, banking, and other sensitive accounts, is a worthwhile habit. Since the analysis happens entirely on your device, there’s no risk in checking as many passwords as you like. Combining a strong, unique password for every account with a password manager remains the most effective overall strategy.

Passphrases made from several unrelated words are generally easier to remember than random strings of characters while still scoring well on a password strength checker. For example, combining four unconnected words with a number or symbol creates something long, memorable, and difficult to guess. If remembering many unique passwords still feels overwhelming, a password manager can store them securely so you only need to remember one master password.