How to Create a Strong Password
A complete guide to creating passwords that protect your accounts from brute-force and dictionary attacks.
What Makes a Password Strong?
Password strength is measured in entropy: the number of bits of randomness. Higher entropy means more possible combinations an attacker must try. A password with 80+ bits of entropy is considered strong against modern hardware.
Weak (<36 bits)
Cracked in seconds to minutes
password123
Fair (36–60 bits)
Cracked in hours to days
Tr0ub4dor&3
Strong (60+ bits)
Years to centuries to crack
xK9#mP2$vL7@nQ4
Step-by-Step Guide
Use at Least 16 Characters
Every additional character exponentially increases crack time. A 16-character password with mixed characters has over 100 bits of entropy.
Mix Character Types
Use uppercase, lowercase, digits, and symbols. Each type increases the pool size: from 26 letters to 88+ printable characters.
Use a Random Generator
Human-created passwords follow predictable patterns. Use a cryptographic random generator (like this tool) for true randomness.
Never Reuse Passwords
If one account is breached, attackers try those credentials on other sites. Every account needs a unique password.
Use a Password Manager
Store your passwords in a dedicated password manager (1Password, Bitwarden, KeePass). Never rely on memory or browser autofill alone.
Enable Two-Factor Authentication
Even strong passwords can be phished. Add a second factor (authenticator app, hardware key) for critical accounts.
Common Mistakes to Avoid
Password vs Passphrase
Random Passwords
- Maximum entropy per character
- Shorter length for same security
- Impossible to memorize
- Requires a password manager
Passphrases
- Easier to type and remember
- Still very secure with 4+ words
- Longer than equivalent passwords
- Some sites have length limits
Read our full Password vs Passphrase comparison for more details.
Ready to Generate a Strong Password?
Use our free password generator for cryptographically secure passwords.
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