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Password Entropy Checker
Password strength
(0 bits)
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Weak
Medium
Strong
Understanding Password Entropy
Password entropy is a measurement of password strength expressed in bits. The higher the entropy, the stronger the password is against brute force attacks.
How Password Entropy Works
Entropy = Log₂(R^L) bits
where R = character pool size, L = password length
Lower case only
a-z (26 chars)
For 8 chars:
37.6 bits
Mixed case
a-z, A-Z (52 chars)
For 8 chars:
45.6 bits
Mixed + Numbers
a-z, A-Z, 0-9 (62 chars)
For 8 chars:
47.6 bits
All characters
a-z, A-Z, 0-9, symbols (90+ chars)
For 8 chars:
52.4+ bits
Tips for Strong Passwords
- Use at least 12 characters
- Include uppercase, lowercase, numbers, and special characters
- Avoid dictionary words and common substitutions
- Don’t use personal information like birthdays or names
- Use a different password for every account
- Consider using a password manager