How to Create a Strong Password in 2026 (And Actually Remember It)

Every year, security researchers publish lists of the most common passwords found in data breaches. Every year, "123456", "password", and "qwerty" sit near the top. The people who use these passwords are not careless — they are simply never taught what makes a password actually strong versus what just looks strong. A password with an exclamation mark at the end and a capital letter at the start feels secure. To an automated cracking tool running a billion guesses per second, it is trivial.

Password strength is measured in bits of entropy — the number of equally likely possibilities an attacker must try to guarantee finding your password. The formula is straightforward: entropy equals the length of the password multiplied by the log base 2 of the character pool size. A password drawn from 72 characters (lowercase + uppercase + digits + common symbols) at 12 characters long has roughly 74 bits of entropy — about 18 quadrillion possible combinations. At a billion guesses per second, that takes about 585 years to exhaust.

The key insight is that length contributes more than complexity. A 25-character password made entirely of lowercase letters has 117 bits of entropy — stronger than a 12-character password with uppercase, numbers, and symbols. Length compounds exponentially. Adding one more character to a 16-character password does more for security than swapping a letter for a symbol.

Substitutions do not help. Replacing "a" with "@" or "e" with "3" is called leet-speak, and every password cracker has it built in. "P@ssw0rd" is not meaningfully stronger than "Password" — attackers try all common substitutions automatically.

Predictable patterns are the second biggest failure. Capitalising the first letter, adding a number at the end, and finishing with an exclamation mark is a pattern so common that cracking tools test it as a template against every dictionary word. "Football1!" is cracked in seconds.

Short passwords are the third problem. Anything under 12 characters is at serious risk from modern hardware regardless of character variety. A 6-character password with symbols can be brute-forced exhaustively in minutes on consumer hardware. An 8-character password falls within hours.

Password reuse is the most dangerous habit of all. When a website is breached and its password database is leaked — which happens to major services every year — attackers immediately test every username/password pair on every other major website. If your email and bank account share a password, one breach compromises both.

The first system is a random password generator combined with a password manager. Generate a 16-character random password for every account, store them all in a password manager like Bitwarden or 1Password, and use a single strong master password to unlock the vault. You only need to remember one password. Every other account gets a unique, random, unguessable credential. This is the approach recommended by every major security organisation and is effectively unbreakable at the individual account level.

The second system is a passphrase: four or more random common words strung together, such as "correct horse battery staple" (popularised by security researcher Bruce Schneier and xkcd). A four-word passphrase from a 7,776-word list has about 51 bits of entropy, which is weaker than a 16-character random password — but it is far easier to remember and still vastly stronger than most people's current passwords. A five-word passphrase hits 64 bits, which is adequate for most personal accounts.

The passphrase approach works well for passwords you need to type regularly and cannot store in a manager — your computer login, your password manager master password, and your email account are good candidates. Use random generation for everything else.

Twelve characters is the absolute minimum for any account you care about; sixteen is better; twenty or more for your most critical accounts. Use a different password for every service — no exceptions, especially for email (which controls every other password reset), banking, and social media. Enable two-factor authentication wherever it is offered. A strong password with 2FA is genuinely very difficult to compromise even if the service is breached.

If you do one thing after reading this: replace your email password with a 16-character randomly generated one and store it in a free password manager. That single change reduces your exposure more than any other security action you can take in five minutes.

QTNest's password generator creates cryptographically random passwords with configurable length and character sets. Set the length to 16 or more, enable all character types, and copy the result directly into your password manager. The password is generated entirely in your browser — it is never sent to any server or stored anywhere.