Password Strength Checker

This checker measures the entropy of a password in bits based on its length and the character sets it uses, then converts that into an estimated offline crack time against a fast GPU attacker. Common patterns such as dictionary words, keyboard runs, repeated characters and year suffixes reduce the score.

Analysis happens entirely in your browser with no network request of any kind, so it is safe to test a password you actually use. Still, the golden rule holds: use a password manager and a unique password per site.