How to Generate Strong Passwords: Best Practices in 2026

Passwords remain the primary line of defense for your online accounts. Despite years of predictions about a passwordless future, most services still rely on them. The difference between a weak password and a strong one can be the difference between a secure account and a compromised one. Here is what you need to know about creating and managing strong passwords in 2026.

What Makes a Password Strong?

A strong password has three properties: length, randomness, and uniqueness. Length is the most important factor. A 20-character password made of random lowercase letters is significantly harder to crack than an 8-character password using all character types. Randomness means the password should not contain dictionary words, predictable patterns, or personal information. Uniqueness means every account should have a different password.

Understanding Entropy

Password strength is measured in bits of entropy. Entropy quantifies how many guesses an attacker would need to try, on average, to crack the password. The formula is simple: entropy = log2(possible characters ^ password length).

For example, a password using lowercase letters only (26 characters) with a length of 12 gives about 56 bits of entropy. Adding uppercase letters, digits, and symbols (roughly 95 printable ASCII characters) with the same length gives about 79 bits. But simply increasing the length to 16 lowercase characters gives about 75 bits, nearly as much. This is why length matters more than complexity.

A good target is at least 70 bits of entropy for important accounts and 80+ bits for critical accounts like email and banking. Most password generators can produce passwords well above this threshold.

Why You Should Use a Password Generator

Humans are terrible at generating randomness. When asked to create a "random" password, people tend to use predictable patterns: a capital letter at the start, numbers at the end, common substitutions like @ for a or 3 for e. Attackers know these patterns and their cracking tools account for them.

A password generator uses a cryptographically secure random number generator (CSPRNG) to produce truly unpredictable output. The Web Crypto API's crypto.getRandomValues() is the standard way to do this in browsers. Unlike Math.random(), which is not cryptographically secure, crypto.getRandomValues() produces output that is suitable for security-sensitive applications.

Password Managers

Using unique, random passwords for every account means you cannot memorize them all. That is where password managers come in. A password manager stores all your passwords in an encrypted vault, protected by a single master password. You only need to remember one strong password, and the manager handles the rest.

Popular options include Bitwarden (open source), 1Password, and the built-in password managers in browsers like Chrome and Safari. The important thing is to use one. Any password manager is far better than reusing passwords or writing them on sticky notes.

Two-Factor Authentication (2FA)

A strong password is your first layer of defense. Two-factor authentication adds a second layer. Even if an attacker obtains your password through a data breach or phishing attack, they still need your second factor to access your account.

The best options in order of security are: hardware security keys (like YubiKey), authenticator apps (like Google Authenticator or Authy), and SMS codes. SMS is the weakest because phone numbers can be hijacked through SIM swapping. Enable 2FA on every account that supports it, especially email, banking, and social media.

Common Mistakes to Avoid

• Reusing passwords. When one service gets breached, attackers try those credentials on other sites. This is called credential stuffing, and it works alarmingly well.
• Using personal information. Your name, birthday, pet's name, or favorite team are easy for attackers to research.
• Short passwords. Anything under 12 characters is too short for important accounts. Aim for 16 or more.
• Predictable patterns. Passwords like Password1! or Summer2026! follow patterns that cracking tools check first.
• Storing passwords in plain text. Do not keep passwords in spreadsheets, text files, or email drafts. Use a password manager.
• Ignoring breach notifications. If a service notifies you of a breach, change that password immediately, along with any other accounts where you used the same password.

Passphrases: An Alternative Approach

A passphrase is a sequence of random words, such as correct horse battery staple. Passphrases are easier to type and remember than random character strings while still providing excellent entropy. A four-word passphrase from a 7,776-word list (like Diceware) provides about 51 bits of entropy. Five words gives about 64 bits, and six words gives about 77 bits. For your password manager's master password, a five or six-word passphrase is an excellent choice.