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Security
Password Strength Checker
Score any password on length, entropy and crack-time — locally in your browser.
Enter password
Analysed locally in your browser — nothing is sent anywhere.
About this tool
Type or paste any password to see its strength, entropy in bits, estimated offline crack time, and specific improvement suggestions. Nothing is sent to a server.
What it does
- •Entropy in bits
- •Estimated offline crack time
- •Actionable improvement tips
- •100% offline
Use cases
- ★Auditing your own passwords
- ★Teaching password hygiene
- ★Verifying generator output
FAQ
Is my password sent to a server?
No. Analysis runs entirely in your browser — no requests, no storage.
How is entropy calculated?
Entropy = length × log2(pool size), where pool size depends on the character sets present.