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Free online password strength analyser tool. Evaluate password security, entropy level, and estimated crack time with detailed improvement suggestions.
Tips
Analyses password strength in real-time as you type, providing entropy calculations, estimated crack time, character pool analysis, and actionable feedback tips. Displays a visual strength meter for intuitive assessment.
Understanding password strength goes beyond simple 'weak/medium/strong' labels. This tool provides the underlying entropy mathematics and practical crack-time estimates so developers and users can make informed decisions about password security.
Developers designing password policies, security-conscious users evaluating their passwords, and anyone building registration or login systems.
Type or paste a password in the input field — analysis updates in real time
Observe the visual strength meter indicating overall strength level
Review the entropy calculation showing the bits of entropy (higher is better)
Check the character pool analysis showing counts of uppercase, lowercase, digits, and symbols
Read the feedback tips for suggestions to improve the password
Password: 'password123' → Low entropy, fast crack time, feedback: add symbols and uppercasePassword: 'Tr0ub4dor&3' → Moderate entropy, moderate crack time, feedback: consider longer lengthPassword: 'correcthorsebatterystaple' → High entropy due to length, despite lower character diversitylong passwords have exponentially more combinations.
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