Password Strength Checker
Analyze your password's entropy, estimate crack time, and get specific improvement suggestions — all processed locally in your browser.
Frequently Asked Questions
Is it safe to type my password here?
Yes. Your password is analysed entirely in your browser and is never sent, stored or logged anywhere.
What is password entropy?
Entropy, measured in bits, estimates how unpredictable a password is. More bits mean exponentially more guesses are needed to crack it.
How is crack time estimated?
It estimates how long a modern attacker would take to brute-force the password based on its entropy and typical guessing speeds.
What makes a strong password?
Length is the biggest factor: aim for 12+ characters mixing upper and lower case, numbers and symbols, and avoid common words or patterns.
Should I use a passphrase?
Yes. A long random passphrase of several unrelated words is both strong and easier to remember than a short complex string.
Does it check against common passwords?
The analyzer flags weak patterns such as dictionary words, repeated characters and predictable sequences in its security checks.