Password Strength Checker

Analyze password strength and get improvement suggestions. Check against common passwords and estimate crack time.

100% client-side No signup Free forever
Enter a password
0/100
- Time to Crack
- Entropy (bits)
- Charset Size

Password Requirements

✗ At least 8 characters
✗ Contains uppercase letter
✗ Contains lowercase letter
✗ Contains number
✗ Contains special character
✗ Not a common password

Your password is checked locally in your browser. It is never sent to any server.

// reference

Password Security Tips

  • Use at least 12-16 characters for important accounts
  • Mix uppercase, lowercase, numbers, and symbols
  • Avoid personal information (names, birthdays, etc.)
  • Don't use dictionary words or common patterns
  • Use a unique password for each account
  • Consider using a password manager
  • Enable two-factor authentication when available
// how to use

How to Use Password Strength Checker

How to Check Password Strength

  1. Enter password: Type or paste a password in the input field.
  2. View strength rating: Instantly see the strength meter and rating.
  3. Read feedback: See specific issues detected and improvement suggestions.
  4. Check crack time: View estimated time to crack the password.
  5. Improve and retest: Modify your password based on suggestions and check again.

Privacy Note

Your passwords are analyzed entirely in your browser. They are never transmitted to our servers or stored anywhere. This is purely client-side security checking.

// features

Features

  • Real-time strength analysis
  • Visual strength meter
  • Crack time estimation
  • Detailed improvement suggestions
  • Common pattern detection
  • Dictionary word checking
  • Leaked password database check (local)
  • Character type breakdown
  • Length recommendations
  • 100% client-side processing
  • Password never transmitted
  • Free with no registration
// about

About Password Strength Checker

Weak passwords remain the top vulnerability in personal and business security. Our strength checker analyzes passwords for weaknesses that attackers exploit, providing actionable recommendations to improve security without arbitrary complexity rules.

Analysis Factors

Comprehensive password evaluation considers:

  • Length: Each character adds exponential difficulty
  • Character variety: Mix of lowercase, uppercase, numbers, symbols
  • Pattern detection: Keyboard walks, repeated characters, sequences
  • Dictionary matching: Common words, names, passwords

Beyond Simple Rules

"P@ssw0rd!" meets typical complexity requirements but is extremely weak due to obvious substitutions. Our checker identifies these patterns that rule-based systems miss. Real security comes from unpredictability, not complexity theater.

Crack Time Estimation

The checker estimates how long different attacks would take: online attacks (rate-limited), offline attacks (leaked database), and targeted attacks (personal information known). "Strong" means years to crack, not seconds.

Privacy Note

All analysis happens in your browser. Passwords are never transmitted or stored. We compare against known weak passwords locally, ensuring your password attempts remain completely private.

Creating Strong Passwords

The best passwords are long and random. A four-word passphrase like "correct-horse-battery-staple" is more secure than "Tr0ub4dor&3" and easier to remember. For unique passwords per site, use a password manager with generated passwords.

// faq

Frequently Asked Questions

How is password strength calculated?
We evaluate: length (most important), character variety (upper, lower, numbers, symbols), common patterns (dictionary words, sequences, keyboard patterns), and estimated crack time. A 12+ character password with variety is much stronger than a short complex one.
Is it safe to check my password here?
Yes! All analysis happens in your browser - passwords are never sent to our servers. You can verify by checking network requests in browser dev tools. For maximum security, you can also disconnect from the internet and the tool still works.
What makes a password weak?
Weak passwords include: dictionary words (password, monkey), personal info (names, dates), common patterns (123456, qwerty), simple substitutions (p@ssw0rd), and short passwords regardless of complexity. Attackers try these patterns first.
How long should my password be?
Minimum 12 characters, ideally 16+. Length beats complexity: "correct-horse-battery-staple" (25 chars, lowercase) is stronger than "P@$$w0rd" (8 chars, complex). Each additional character exponentially increases crack time.
Why do password requirements vary between sites?
Different sites have different security needs and legacy systems. Some require complexity rules that research shows aren't optimal. Modern guidance favors length over complexity. Our tool shows actual strength regardless of arbitrary rules.
What is estimated crack time?
We estimate how long a dedicated attacker with modern hardware would need to crack your password. This assumes they're targeting you specifically. Times range from instant (common passwords) to centuries (strong passwords). Aim for years or more.