What makes a password strong?

Length matters most, followed by the variety of characters used. Each extra character multiplies the number of possible combinations, so a 16-character password is exponentially harder to crack than a 10-character one with the same character set.

What is password entropy?

Entropy measures unpredictability in bits: log2 of (character-set size raised to the password length). Around 60 bits resists casual attacks, while 80+ bits is considered strong against offline cracking with modern hardware.

Are passphrases better than complex short passwords?

Usually yes. Four or five random, unrelated words (like a diceware passphrase) are both easier to remember and higher in entropy than a short string of letters, digits, and symbols.

How fast can attackers actually crack passwords?

Offline attacks with GPU rigs can test billions of guesses per second against stolen hash databases. An 8-character password using every character type can fall in hours, while each added character multiplies the cracking time dramatically.

Should I use a password manager?

Yes — reusing passwords is the biggest real-world risk, since one breached site exposes every account sharing that password. A manager generates and stores a unique random password per site, so you only memorize one strong master passphrase.

Password Strength Calculator

Estimate how long a brute-force attack would take to crack your password. See entropy in bits and get actionable strengt

Password Analysis

Enter Password to Analyze

Your password is analyzed locally and never sent to any server

Privacy Notice

All password analysis is performed locally in your browser. No passwords are transmitted or stored.