Password Strength Checker

Test your password strength and get detailed security analysis with improvement suggestions. Protect your accounts with stronger passwords.

Password Strength Checker

Enter a password to analyze its strength and security. Your password is never transmitted or stored.

Password to Analyze

🔒 Your password is analyzed locally in your browser and never sent to our servers.

Key Features

Real-time password strength analysis

Entropy calculation and crack time estimates

Detailed security checks and pattern detection

Password composition analysis

Personalized improvement suggestions

100% client-side processing for privacy

Understanding Password Security

Entropy: Measures password unpredictability; higher entropy means stronger security

Character Space: Total possible characters (lowercase + uppercase + numbers + symbols)

Crack Time: Estimated time for brute force attacks assuming 1 billion attempts/second

Pattern Detection: Identifies common words, sequences, and repeated characters

Security Score: Composite rating based on length, complexity, and vulnerability factors

Tips & Best Practices

Length First: Aim for 12+ characters; every additional character exponentially increases security

Mix Character Types: Combine uppercase, lowercase, numbers, and special symbols

Avoid Predictable Patterns: No keyboard sequences (qwerty), repetition (aaa), or common substitutions

Use Passphrases: Random words with separators are memorable yet secure (correct-horse-battery-staple)

Unique Per Account: Never reuse passwords; use password managers for easy management

Enable 2FA: Two-factor authentication provides crucial additional security layer

Regular Updates: Change passwords for sensitive accounts periodically or after breaches

Avoid Personal Info: Don't use birthdays, names, addresses, or other personally identifiable data

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Frequently Asked Questions

Is my password safe when using this tool?

Yes, absolutely. All password analysis happens entirely in your browser using JavaScript. Your password is never transmitted to our servers, stored, or logged anywhere.

How accurate are the crack time estimates?

The estimates are based on current computing capabilities assuming 1 billion attempts per second brute force attacks. Actual crack times vary significantly based on attack methods, available resources, and luck.

What makes a password truly secure?

A secure password is long (12+ characters), unpredictable, unique for each account, and combined with two-factor authentication. Consider using a password manager to generate and store strong passwords.

Why does password length matter more than complexity?

Each additional character exponentially increases the number of possible combinations. A 16-character password with only letters is stronger than an 8-character password with all character types.

Should I use this tool for all my passwords?

While this tool is secure, it's best practice to use a dedicated password manager that can generate, store, and analyze passwords offline for maximum security and convenience.

What's the difference between password strength and security?

Strength measures resistance to cracking, while security includes broader factors like uniqueness, proper storage, 2FA usage, and protection against phishing and social engineering.

How often should I check my password strength?

Check strength when creating new passwords or updating existing ones. Regular audits of your password portfolio help identify weak passwords that need strengthening.

Can strong passwords be compromised?

Yes, even strong passwords can be compromised through data breaches, keyloggers, or phishing. This is why unique passwords per account and 2FA are crucial security practices.