Security
Password Strength Checker
Check password strength with readable scoring signals, entropy estimates, character-set analysis, and practical suggestions for improvement.
What Password Entropy Calculator helps you do
Password entropy is a practical way to estimate how much search space a password covers based on its length and character set.
This calculator is useful when you want a more quantitative password view than a simple weak-versus-strong badge.
Use the tool
Advertisement
Frequently asked questions
What is password entropy?
Password entropy is an estimate of how many bits of unpredictability a password contains based on its length and symbol space.
Why is entropy useful?
It gives a rough way to compare passwords and understand how length and character variety change guessing difficulty.
Is entropy a guarantee of security?
No. It is a useful estimate, but real-world security also depends on uniqueness, storage, phishing resistance, and system design.