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Password Strength Checker

Analyze your password strength in real-time. Get crack time estimates and personalized improvement suggestions. All analysis happens locally in your browser.

Enter Password to Analyze
Password Strength Empty
At least 12 characters
Uppercase letters (A-Z)
Lowercase letters (a-z)
Numbers (0-9)
Special characters (!@#$...)
No common patterns
0
Entropy (bits)
0
Character Pool
0
Length
Estimated time to crack
Enter a password to see estimate
🛈 Privacy Note: Your password is analyzed entirely in your browser. No data is sent to any server. Crack time estimates assume an attacker with high-performance hardware (100 billion guesses/second).

About Password Strength Checker

Test the security of your passwords with our comprehensive strength analyzer. Get real-time feedback on password length, character variety, and common patterns. See how long it would take for an attacker to crack your password using brute-force methods.

How to Use

  1. Type or paste your password into the input field.
  2. Watch the real-time strength meter update as you type.
  3. Check the checklist to see which requirements your password meets.
  4. Review the estimated crack time to understand your password's vulnerability.
  5. Follow the improvement suggestions to create a stronger password.

Frequently Asked Questions

How accurate is the crack time estimate?

The crack time estimate assumes an attacker using specialized hardware capable of 100 billion guesses per second (distributed attack scenario). This represents a worst-case scenario with powerful resources. For most attackers with limited resources, the actual time would be significantly longer.

Is my password safe when using this tool?

Yes, completely. All analysis happens locally in your browser using JavaScript. Your password never leaves your device or is transmitted over the internet. You can safely test even your most sensitive passwords.

What does "entropy" mean?

Entropy measures the amount of randomness or unpredictability in a password, expressed in bits. Higher entropy means more possible combinations an attacker would need to try. We recommend at least 60 bits for important accounts and 80+ bits for maximum security.

What are common patterns to avoid?

Common patterns include sequential characters (123, abc), repeated characters (aaa, 111), keyboard patterns (qwerty, asdf), dates, and common words. Our checker detects these patterns and suggests removing them for better security.

What makes a password truly strong?

A truly strong password is: at least 16 characters long, uses all character types (uppercase, lowercase, numbers, symbols), avoids dictionary words and personal information, has no predictable patterns, and has high entropy (80+ bits).