How to Create a Strong Password

A practical guide to password security — what works, what doesn't, and how to protect yourself

Passwords are the first line of defense for your online accounts. Yet most people still use weak, reused passwords that can be cracked in seconds. This guide explains what makes a password strong, how password cracking works, and how to manage passwords without losing your mind.

Quick start: Use our password generator to create a strong random password, and get a password strength estimate for any password you're considering.

What Makes a Password Strong?

Two factors determine password strength: length and entropy (randomness).

Length is king. A 12-character randomly generated password is exponentially harder to crack than an 8-character one, even if the 8-character one uses symbols. Each additional character multiplies the number of possible combinations.

Here's how long it takes to crack different passwords at modern speeds:

Password	Type	Time to Crack
`password123`	Common word + numbers	Instant
`P@ssw0rd!`	Common substitutions	Seconds
`Tr0ub4dor&3`	11 chars, mixed	~3 days
`correct horse battery staple`	4 random words (25 chars)	Centuries
`xK8m#pQ2!vL9$wR5`	16 random chars	Billions of years

Common Password Mistakes

Reusing passwords — If one site gets breached, every account with the same password is compromised
Personal info — Birthdays, pet names, street names, and anniversaries are easy to guess or find on social media
Common substitutions — Replacing o with 0, e with 3, or s with $ is well-known to cracking tools
Keyboard patterns — qwerty123, asdfgh, and 1q2w3e4r are in every crack dictionary
Short passwords — Anything under 10 characters can be cracked in reasonable time

Use a Password Manager

The best way to have strong, unique passwords for every account is a password manager. Tools like Bitwarden, 1Password, and KeePass generate and store random passwords for you. You only need to remember one master password.

Password managers also autofill login forms, flag weak passwords, and alert you if a site you use has been breached. There's no excuse not to use one — many are free.

Two-Factor Authentication (2FA)

A strong password alone isn't enough anymore. Two-factor authentication adds a second layer — usually a code from an app (like Google Authenticator or Authy) or a hardware key (like YubiKey). Even if someone steals your password, they can't log in without the second factor. Enable 2FA on every account that supports it.

Check If You've Been Breached

Services like HaveIBeenPwned let you check if your email or passwords have appeared in known data breaches. If your password shows up in a breach, change it immediately everywhere you used it. Use our password generator to create a replacement.

The Bottom Line

Use a password manager
Generate random 16+ character passwords for every account
Enable 2FA everywhere
Never reuse passwords
Check HaveIBeenPwned regularly

Use our password generator and password strength checker to get started.

Published September 2026