An advanced tool to evaluate the strength of your passwords. It goes beyond simple checks by calculating the password's entropy, which is the true measure of its unpredictability. The calculator provides a detailed breakdown, showing the character set size (lowercase, uppercase, numbers, symbols) and the total number of possible combinations. See a quantitative strength score, an estimated time to crack using modern hardware, and actionable feedback to improve your password's security. All calculations are performed entirely on the client-side, so your password is never transmitted.