Password Strength Checker
Test how strong your password really is. Nothing leaves your browser.
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Length
0
Entropy
0 bits
Crack time
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- At least 12 characters
- Has uppercase letters
- Has lowercase letters
- Has numbers
- Has symbols
How Strength Is Measured
Password entropy is calculated as log₂(charsetlength). Longer passwords with more character variety yield higher entropy and exponentially longer crack times.
FAQ
Is my password sent anywhere?
No. Everything runs in your browser. Nothing is logged or transmitted.
What's a good entropy?
60+ bits is strong, 80+ bits is very strong.
Length or complexity?
Length matters more. A 20-character lowercase password beats a short complex one.
Does it check leaks?
No — for that, use a service like Have I Been Pwned.
Should I use a manager?
Yes. Password managers generate and store strong unique passwords for you.
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