What actually makes a password hard to crack, why length beats complexity, and how sites store passwords safely using hashing.

Most password advice focuses on rules: use a symbol, use a number, use a capital letter. Those rules exist for a reason, but they are not actually what makes a password strong. Understanding what really matters makes it much easier to create passwords that are both secure and manageable.

Length matters more than complexity

Password strength comes down to how many possible combinations an attacker would have to try to guess it, and length increases that number far faster than adding symbols does. A random 16-character password using only lowercase letters is harder to brute-force than an 8-character password stuffed with symbols and numbers. This is why many security guidelines now emphasize long passphrases over short, complex-looking strings that are hard for humans to remember and, ironically, often easier to crack than people assume.

What actually breaks a password

• Reuse. The single biggest real-world risk is not brute force, it is reusing the same password across sites. When one site is breached, attackers try the same email and password combination everywhere else, a technique called credential stuffing.
• Predictable patterns. Substituting "a" with "@" or adding "123" at the end are patterns attackers already account for. They do not add meaningfully more security than the base word.
• Personal information. Names, birthdays, and pet names are the first things guessed in a targeted attack.

A practical approach

• Use a unique, randomly generated password for every account. This is the single biggest improvement most people can make.
• Use a password manager to store them, so you never have to memorize dozens of random strings.
• Where a service supports it, turn on two-factor authentication, so a leaked password alone is not enough to get in.

SEOpeck's Password Generator creates random passwords with configurable length and character sets, and the Password Strength Test tool gives an honest read on how long a given password would realistically hold up.

How sites are supposed to store your password

A well-built site never stores your actual password. Instead, it stores a hash: the output of a one-way function run against your password. When you log in, the site hashes what you typed and compares it to the stored hash, without ever keeping the original password anywhere. If the database is breached, an attacker gets hashes, not passwords.

Not all hashing is equal, though. Fast, general-purpose hash functions like MD5 or SHA were built for speed and data integrity checks, not for protecting passwords, and modern hardware can attempt billions of guesses per second against them. Password-specific algorithms like bcrypt are deliberately slow and include a random "salt" for every password, which makes large-scale guessing far more expensive. If you ever see a site describe how it stores passwords, bcrypt (or similar algorithms like Argon2 or scrypt) is the reassuring answer; plain MD5 or SHA1 is a warning sign.

For quick one-off checks, SEOpeck's Hash Generator supports multiple algorithms in one place if you need to generate or compare a hash value.