Strong Password Generator

What this tool does

This tool creates a strong password at whatever length you choose, mixing uppercase and lowercase letters, numbers, and symbols every time. Set the length, and a fresh password appears instantly, ready to copy for your email, banking, or work accounts. No sign-up, no waiting.

How to use it

1. Drag the length slider to set how many characters you want, anywhere from 12 to 40. It starts at 16.
2. A password appears straight away, combining all four character types. Press the refresh button any time you want a different one.
3. Press Copy Password to put it on your clipboard. You can also edit the field directly if you want to adjust the result.

How it works

Each time you change the length or hit refresh, the tool builds a password by drawing characters from four sets, lowercase letters, uppercase letters, numbers, and symbols, and stringing them together to the length you set. It all happens in your browser, so the password is never sent over the internet or saved anywhere. That local generation is a big part of why it is safe to create one here: nothing leaves your device.

What actually makes a password strong

If you take one thing from this page, make it this: length matters more than anything else. Security people measure password strength in entropy, roughly the number of guesses an attacker would need, and every character you add multiplies that number. That is why a long password made of ordinary characters beats a short one crammed with symbols. A 16-character password has astronomically more possible combinations than an 8-character one, even when the shorter one looks more complicated.

This is also the thinking behind modern guidance from NIST, the body that sets the standard. Its updated advice treats length as the primary measure and has dropped the old "must include a capital and a symbol" rules, because those tend to push people toward predictable passwords like "Password1!" rather than genuinely strong ones. The mix of character types this tool adds does help by widening the pool a little, but the length you choose is doing most of the work, so leaning toward the longer end of the slider is the simplest way to a stronger password.

Habits that protect you more than any generator

A strong password is only part of staying secure. Two habits matter even more:

• Use a different password for every account. Reuse is the single biggest real-world risk: when one site is breached, attackers try that same password everywhere else you use it. A unique password per site contains the damage.
• Use a password manager to create and store them. It removes the need to remember or retype long strings, which is the usual reason people fall back on weak, repeated passwords. You can test any password's strength if you want to see where one stands.

And contrary to the old rule, you do not need to change a strong, unique password on a schedule; change it only if you have reason to think it has been exposed. For the few passwords you genuinely have to memorise, like a device login or a password manager's master password, a passphrase of four or five random words is both strong and far easier to recall than a random jumble.

Questions people ask

References

1. National Institute of Standards and Technology. SP 800-63B, Digital Identity Guidelines: Authentication and Authenticator Management. https://csrc.nist.gov/pubs/sp/800/63/b/4/final