Password Strength Checker
Check password strength and get improvement suggestions. Free security tool.
All processing happens in your browser. Your data never leaves your device.
Strength
Requirements
✗ At least 8 characters
✗ Uppercase letter
✗ Lowercase letter
✗ Number
✗ Special character
~ 12+ chars (strong)
Details
11
Length
0
Unique chars
0
Entropy bits
Crack time
How to Use
- 1Enter a password to check.
- 2See strength score and requirements.
- 3Follow suggestions to improve security.
What is Password Strength Checker?
Password Strength Checker analyzes password strength using entropy calculation and provides actionable suggestions to improve security.
Key Features
- Entropy calculation
- Crack time estimate
- Requirement checklist
- Improvement suggestions
- Real-time analysis
- 100% client-side
Password Strength Checker vs Other Tools
| Feature | Password Strength Checker | Other Tools |
|---|---|---|
| Client-side processing | Yes | Varies |
| No signup required | Yes | Often required |
| Privacy-first (no data sent) | Yes | Rarely |
| Free & unlimited | Yes | Often limited |
| No ads interruption | Yes | Often no |
FAQ
How does validation work?
Validation tools check your input against specific patterns and rules. For example, email validation checks the format against RFC 5322 standards, and credit card validation uses the Luhn algorithm.
Is validated data sent to a server?
No. All validation happens locally in your browser using JavaScript pattern matching and algorithms.