Passphrase vs. Password: Which Is Better?

Updated June 2025 · 4 min read

You've probably heard the advice: use a strong, unique password for every account. But what counts as "strong"? And is a passphrase actually better than a random string of characters? Let's break it down.

What's the Difference?

A password is a random string of characters — hard to guess, but also hard to remember and easy to mistype. A passphrase is a sequence of random words, often with a number and special character added, that reads more like a phrase than a code.

How They Compare

The Math Behind It

Security researchers measure password strength in bits of entropy — essentially, how unpredictable the password is. A 16-character random password using all character types has roughly 105 bits of entropy. A 4-word passphrase chosen from a list of 7,776 words (like the EFF word list) has about 51 bits — but a 6-word passphrase hits 77 bits, and adding a number and symbol pushes it further.

The key insight: length beats complexity. A passphrase like "Coral-Ridge-42-Falcon!" has 22 characters — that length alone provides enormous protection, even though the individual words are recognizable English.

When to Use Each

Use a random password for most online accounts, especially ones stored in a password manager where you never type them manually. The randomness provides excellent security and a manager removes the memorability problem.

Use a passphrase for anything you need to type by hand — your laptop login, your password manager's master password, or accounts on devices where typing a random string is annoying. Make sure it includes a number and special character if the site requires them.