What makes a password strong?
A strong password is long, unpredictable, and unique to one account. Randomness matters most: a password built from a dictionary word with a number on the end looks complex but follows a pattern attackers try early.
Password Strength Checker
Check how strong your password is. Your password is analyzed privately in your browser and is never sent or stored anywhere.
Overall strengthEnter a password
- Length
- —
- Estimated entropy
- —
- Uppercase letters
- —
- Lowercase letters
- —
- Numbers
- —
- Symbols
- —
Entropy is an estimate based on length and the character types used, reduced when common patterns are detected. It cannot predict real-world cracking time, and no checker can guarantee a password is secure.
Private by design — your password never leaves your device.
All analysis happens locally in your browser. Nothing you type is sent to a server, saved, or placed in the page address.
Need a stronger password?
Generate a Secure PasswordWhy password length matters
Every extra character multiplies the number of possible passwords. Adding length is usually the simplest way to make a password harder to guess, which is why this checker gives length significant weight.
Password length vs. complexity
Mixing uppercase, lowercase, numbers, and symbols enlarges the character pool, but a short complex password can still be weaker than a longer one. Predictable substitutions like "@" for "a" add little. Length plus randomness beats cleverness.
What password entropy means
Entropy, in bits, estimates how hard a password would be to guess if it were chosen at random. This checker multiplies length by the size of the character pool in use, then lowers the estimate when it spots repeated characters, sequences, keyboard patterns, or common words. Real attackers use smarter methods, so treat the number as a guide rather than a guarantee.
Why unique passwords matter
When a site is breached, leaked passwords are replayed against other services. A unique password for every account keeps one breach from unlocking the rest.
Why password managers can help
A reputable password manager can create, store, and fill long unique passwords, so you only need to remember one strong master passphrase.
Why multi-factor authentication adds protection
Multi-factor authentication requires something beyond your password, such as an authenticator app or security key. Even if a password is stolen, the second factor can stop an attacker from signing in.
Why no checker can guarantee an account is secure
A strength checker only sees the characters you type. It cannot know whether the password was reused, leaked, phished, or stored insecurely by a service. Use it as one signal alongside unique passwords, a password manager, and multi-factor authentication.
Frequently asked questions
- Is it safe to type my password into this checker?
- The analysis runs entirely in your browser and the password is never sent to a server. Even so, as a general habit, avoid typing your most sensitive real passwords into any website — testing a similar password works just as well.
- Does CreateFreePassword.com store my password?
- No. The password is kept only in temporary page memory while you type. It is not saved in cookies, local storage, URLs, or logs, and it is discarded when you clear the field or leave the page.
- What is password entropy?
- Entropy, measured in bits, estimates how many guesses an attacker would need if a password were chosen at random. Each extra bit roughly doubles the guesses. It is an estimate, not a precise prediction of cracking time.
- How long should a strong password be?
- For randomly generated passwords, 16 characters is a strong baseline and 20 or more is better where the service supports it. Human-chosen passwords usually need to be longer to reach the same strength.
- Is a longer password better than a complicated password?
- Usually, yes. Each additional character multiplies the number of possibilities, so length tends to add more strength than swapping a letter for a symbol. The best passwords are both long and random.
- Should I reuse a strong password?
- No. If any site that uses the password is breached, attackers can try it everywhere else. Use a unique password for every account, ideally stored in a password manager.
Ready for a new password? Use the Free Password Generator.