Password Strength Meter

Analyze your password's strength with detailed metrics including entropy calculation and crack time estimates.

Privacy First

By default, passwords are analyzed in your browser and never sent to our servers. You can optionally use server-side analysis for environments without JavaScript.

Maximum 72 characters

Understanding Password Security

Password strength is crucial for protecting your online accounts from unauthorized access. Our password strength meter analyzes your password using the same algorithms used by security researchers to estimate how long it would take an attacker to crack your password using various methods.

What Makes a Strong Password?

A strong password typically combines length, complexity, and unpredictability. While adding numbers and symbols helps, length is generally more important. A 16-character passphrase using only lowercase letters can be stronger than an 8-character password with mixed characters. Avoid common words, names, dates, and predictable patterns like "password123" or "qwerty".

Understanding Crack Time Estimates

Online (throttled): Assumes attackers face rate limiting (100 guesses/hour), typical for web login forms. Offline (slow hash): Assumes attackers have stolen a database using bcrypt or similar slow hashing (10,000 guesses/second). Offline (fast hash): Assumes weak hashing like MD5 with modern GPUs (10 billion guesses/second). Always assume the worst-case scenario for sensitive accounts.

Password Entropy Explained

Entropy measures password randomness in bits. Each additional bit doubles the number of possible combinations. A password with 40 bits of entropy has 2^40 (about 1 trillion) possible combinations, while 80 bits has 2^80 combinations. Generally, aim for at least 60-80 bits of entropy for important accounts.

Best Practices

Use a unique password for every account - never reuse passwords. Consider using a password manager to generate and store strong, random passwords. Enable two-factor authentication (2FA) whenever possible. For memorable passwords, try combining random words into a passphrase. Never share your passwords or enter them on suspicious websites.

Understanding Password Security

Password strength is crucial for protecting your online accounts from unauthorized access. Our password strength meter analyzes your password using the same algorithms used by security researchers to estimate how long it would take an attacker to crack your password using various methods.

What Makes a Strong Password?

A strong password typically combines length, complexity, and unpredictability. While adding numbers and symbols helps, length is generally more important. A 16-character passphrase using only lowercase letters can be stronger than an 8-character password with mixed characters. Avoid common words, names, dates, and predictable patterns like "password123" or "qwerty".

Understanding Crack Time Estimates

Online (throttled): Assumes attackers face rate limiting (100 guesses/hour), typical for web login forms. Offline (slow hash): Assumes attackers have stolen a database using bcrypt or similar slow hashing (10,000 guesses/second). Offline (fast hash): Assumes weak hashing like MD5 with modern GPUs (10 billion guesses/second). Always assume the worst-case scenario for sensitive accounts.

Password Entropy Explained

Entropy measures password randomness in bits. Each additional bit doubles the number of possible combinations. A password with 40 bits of entropy has 2^40 (about 1 trillion) possible combinations, while 80 bits has 2^80 combinations. Generally, aim for at least 60-80 bits of entropy for important accounts.

Best Practices

Use a unique password for every account - never reuse passwords. Consider using a password manager to generate and store strong, random passwords. Enable two-factor authentication (2FA) whenever possible. For memorable passwords, try combining random words into a passphrase. Never share your passwords or enter them on suspicious websites.