Web Tools
Password Strength Analyzer
Analyze password strength with entropy calculation, pattern detection, crack time estimation, and improvement suggestions. Detects keyboard patterns, common words, sequential characters, and more. Runs entirely in your browser — your data never leaves your machine.
password strength security entropy analyzer crack-time
Published May 31, 2026
All interactive tools run entirely in your browser. Your data never leaves your device.
How It Works
Type a password to see its strength analysis in real-time. The analyzer calculates entropy, detects common patterns, estimates crack time, and provides actionable suggestions to improve security.
Features
- Entropy calculation: Shannon entropy based on character set size and length
- Strength meter: visual score from 0-100 with 5 levels (Very Weak to Very Strong)
- Pattern detection: keyboard patterns, sequential chars, common words, dates, repeats
- Crack time: estimated time to crack at 10 billion guesses/second
- Character analysis: shows which character types are used
- Suggestions: actionable tips to improve password strength
- Show/hide toggle: safely view the password being analyzed
- 5 examples: passwords ranging from weak to very strong
- Private: runs entirely in the browser — your password never leaves your machine
Use Cases
- Testing password strength before using it on a real account
- Educational tool for understanding what makes passwords secure
- Auditing existing passwords for weaknesses
- Demonstrating the impact of length vs. complexity