Password Strength Analyzer
Estimate password strength from length, character variety, and common patterns entirely in your browser; nothing you type is sent to the server.
Free to use
Password to test
Everything runs in your browser. Nothing you type here is sent to the server, logged, or stored — reload the page and it is gone.
This is a heuristic estimate, not a guarantee. It cannot know whether a password has already appeared in a real-world data breach.
Analysis
How to use
Type a candidate password to see length, character variety, an entropy estimate, and warnings about common weak patterns (repeated characters, keyboard runs, sequences, and a short list of extremely common passwords). Use this to sanity-check a password you are about to set — never to test a password you already use somewhere important, since re-typing it elsewhere is its own small risk.