Cybersecurity
Password Entropy Analyzer
Analyze password strength with entropy calculations, crack time estimates for various hash algorithms, and pattern detection.
Estimated time: < 1 min
Difficulty level: Beginner
Privacy: Runs locally
5000ms CPU256MB RAM64KB in · 256KB outEducational, no sensitive data
Mode
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