How to Create a Strong Password — Best Practices (2026)

Updated October 2026 · 4 min read

Weak passwords remain the number-one cause of data breaches. In 2024, "123456" was still the world's most common password. Here is exactly what makes a password strong — and what attackers exploit when it is not.

What Makes a Password Strong?

Security researchers measure password strength by the time a computer would take to crack it using brute force. The two key factors are length and character variety:

A 16-character password using uppercase, lowercase, numbers and symbols has approximately 95^16 = 44 quintillion possible combinations — effectively uncrackable with today's hardware.

NIST Password Guidelines (2024)

The US National Institute of Standards and Technology updated its password guidance in 2024:

• Minimum 8 characters for standard accounts; 15+ recommended
• No mandatory complexity rules — forcing special characters often leads to predictable patterns (Pa$$w0rd)
• No scheduled password changes unless there is evidence of compromise
• Check against known breached passwords — use services like Have I Been Pwned
• Allow all printable characters including spaces (passphrases are encouraged)

Passphrase vs Random Password

A passphrase like correct-horse-battery-staple is 28 characters long, memorable, and has approximately 2^44 combinations (4 random common words). A 16-character random password like vR9#kLm2$wQz@4Tp is stronger but impossible to memorise — use a password manager for those.

Why You Need a Password Manager

The only way to use a unique, strong password for every account is a password manager (Bitwarden, 1Password, Dashlane). It generates, stores and auto-fills credentials. You only need to remember one master passphrase. Free options like Bitwarden are excellent.

Two-Factor Authentication (2FA)

Even a perfect password can be stolen via phishing or a site breach. Always enable 2FA on important accounts. Use an authenticator app (Google Authenticator, Authy) rather than SMS — SMS 2FA can be bypassed via SIM-swapping attacks.