Cybersecurity

Password Entropy Analyzer

Analyze password strength with entropy calculations, crack time estimates for various hash algorithms, and pattern detection.

< 1 min

Beginner

Runs locally

All Cybersecurity tools

1000ms CPU32MB RAM64KB in · 32KB outEducational, no sensitive data

Mode

Password to Analyze

Max 256 characters. Analysis runs locally - your password never leaves your browser.

Export

Download results as PDF, CSV, or JSON.

Run the tool to enable exports.

Learn About Password Security

What is Password Entropy?

Entropy measures the randomness or unpredictability of a password in bits. Higher entropy means more possible combinations for attackers to try. A 40-bit password has 2^40 (about 1 trillion) possible combinations.

Why Does Hash Algorithm Matter?

Different hashing algorithms have vastly different cracking speeds. MD5 can be cracked billions of times faster than bcrypt. That's why modern applications use slow algorithms like bcrypt, Argon2, or scrypt.

NIST Password Guidelines

Minimum 8 characters (12+ recommended)
Allow all printable characters including spaces
Screen against known compromised passwords
Don't require arbitrary complexity rules

Creating Strong Passwords

Passphrases - 4+ random words are easier to remember
Password manager - Generate and store unique passwords
Avoid patterns - No keyboard walks, dates, or names
Enable 2FA - Adds another layer of security

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Learn About Password Security

What is Password Entropy?

Why Does Hash Algorithm Matter?

NIST Password Guidelines

Minimum 8 characters (12+ recommended)
Allow all printable characters including spaces
Screen against known compromised passwords
Don't require arbitrary complexity rules

Creating Strong Passwords

Passphrases - 4+ random words are easier to remember
Password manager - Generate and store unique passwords
Avoid patterns - No keyboard walks, dates, or names
Enable 2FA - Adds another layer of security