Password Strength Checker
Analyze password strength with entropy, pattern detection and crack time estimation
- 100% free
- No sign-up
- No limits
- Instant results
- Entropy calculation in bits
- Pattern detection (keyboard walks, sequences, repeats)
- Crack time estimation
- 100% client-side — your password never leaves your browser
What is Password Strength Checker?
A password strength checker analyzes your password's security by calculating entropy (randomness in bits), detecting common patterns like keyboard walks and repeated characters, and estimating how long a brute-force attack would take.
This tool runs entirely in your browser — your password is never sent to any server.
How to use Password Strength Checker
- 1
Enter your password
Type or paste a password into the input field. Use the eye icon to toggle visibility.
- 2
Review the score
See your password strength score from 0-100 with a color-coded rating.
- 3
Check crack time
View estimated time to crack assuming 10 billion guesses per second.
- 4
Fix issues
Follow the improvement tips to strengthen your password.
Everything this tool
does for you
- Real-time entropy calculation in bits
- Pattern detection: keyboard walks, sequences, repeats
- Common password database check
- Crack time estimation (10B guesses/sec)
- Character type breakdown
- 100% client-side — password never leaves your browser
Related free tools
Frequently asked questions
This tool fixed one thing.
Now fix the whole site.
Our scanner runs 240+ checks across 10 audit areas, ranks every issue by the score points it costs, and hands you the code to paste.
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