Password Strength Analyzer
Analyze password strength and get actionable improvement tips.
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Enter a password above to analyze its strength
Everything runs in your browser — nothing is sent to any server
Instantly analyse any password's true strength using Shannon entropy, crack-time estimation, pattern detection, and a comprehensive criteria checklist — all computed locally, never sent to a server.
Key Features
Shannon Entropy Score
Calculates bits of entropy based on character-set pool size and length, giving a mathematically rigorous strength figure.
Crack-Time Estimation
Estimates how long a 10-billion-guesses-per-second offline attack would take and presents it in human-readable form (seconds to centuries).
Pattern Detection
Flags keyboard walks (qwerty, asdf), sequential runs (123, abc), repeated characters, and common dictionary bases.
Top-200 Common Password Check
Instantly warns if your password matches any of the 200 most commonly leaked passwords.
8-Criteria Checklist
Checks length, uppercase, lowercase, digits, symbols, no common patterns, not in top passwords, and sufficient entropy.
Actionable Suggestions
Provides specific improvement tips tailored to the weaknesses found in your password.
How to Use
- 1Type or paste your password into the input field.
- 2Review the strength bar and entropy score that update in real time.
- 3Check the criteria checklist to see exactly which requirements are met.
- 4Read the suggestions panel for specific tips on improving your password.
- 5Use the show/hide toggle to reveal or mask the password while typing.