Password Strength Checker
Analyze any password's entropy, estimated crack time, and weaknesses in real time.
Knowledge Base & Educational Companion: What Makes a Password Strong
Password strength is best measured in entropy — the number of bits of unpredictability. More entropy means exponentially more guesses for an attacker to try before success.
1. Length Beats Complexity
Each additional character multiplies the search space far more than swapping a letter for a symbol. A long passphrase often beats a short, cryptic string.
2. Estimated Crack Time
Crack time projects how long an offline attacker guessing billions of combinations per second would need. It is an estimate of resistance, not a guarantee.
3. Privacy First
This checker runs entirely in your browser. The password is never transmitted, logged, or stored, so you can safely test even real credentials.
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