Password Strength Checker
Analyze your password's strength, entropy, and estimated crack time. 100% client-side — nothing is sent to any server.
Enter a Password
Type above to begin
—
0.0 bits
Length
0charsUnique Chars
0Char Types
0of 4How It Works
We calculate entropy (randomness) based on character types and length. Higher entropy means more possible combinations, making the password harder to crack.
Password Best Practices
- Use a unique password for every account.
- Use a password manager to store them safely.
- Enable two-factor authentication (2FA) whenever possible.
- Passphrases (e.g., "correct-horse-battery-staple") are both strong and memorable.
Entropy Formula
H = Entropy (bits), L = Password length, N = Charset size
About the Password Strength Checker
This password strength checker provides quick everyday calculations for tips, discounts, passwords, and daily tasks. Analyze password strength, entropy, and crack time.
Use whenever you need a fast answer without opening a spreadsheet.
Adjust the inputs above to model your specific scenario with the Password Strength Checker.
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