Password strength checker
Check password strength with entropy calculation, time-to-crack estimate and common pattern detection. Nothing is stored or sent.
- Free, no sign-up
- No data stored
- Reviewed 2026-01-15
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About the Password Strength Checker
Paste a password to see its estimated strength. The checker calculates entropy (bits), estimates time-to-crack against offline attacks, and identifies common patterns (dictionary words, keyboard walks, dates, repetition).
All processing happens on the server with no logging. Your password is not stored or transmitted beyond this session.
How to use the Password Strength Checker
- Enter a password.
- View the strength score and entropy.
- Check identified patterns and weaknesses.
- See the estimated time-to-crack.
Frequently asked questions
How is time-to-crack calculated?
Based on entropy and an assumed attack speed (10 billion guesses/second for offline attacks). Real time depends on the hash algorithm and attacker hardware.
Is my password sent anywhere?
No. It is processed server-side in memory only, with no database storage, no logging and no network transmission to third parties.
What makes a password weak?
Dictionary words, common substitutions (p@ssw0rd), keyboard patterns (qwerty), dates and short length all reduce effective entropy.