ClipTen Free tools Strong password generator

Strong password generator

Make a strong, random password of any length from 6 to 64 characters, on your own computer. Nothing is sent or saved; the randomness comes from your browser’s cryptographic generator.

How to use it

Choose a length. 16 or more is a good default; 20 is better.
Keep all four character types on unless a site refuses symbols.
Press Copy, then save it in your password manager straight away.

What makes a password strong

Length and randomness, not cleverness. A password made by a person follows patterns that cracking tools know: a word, a capital at the start, a number and an exclamation mark at the end. A random one has no pattern, so the only attack is trying every option.

The strength shown under the password is its entropy in bits. Each extra bit doubles the guesses needed. A 20-character password from all four sets is about 130 bits, far beyond what any computer can try.

Bits	Rating	Example
Under 50	Weak	8 lower-case letters
50 to 74	Fair	10 characters, all sets
75 to 99	Strong	14 characters, all sets
100 or more	Very strong	16 or more characters, all sets

8, 12, 16 or 20 characters?

Drag the length slider to the number a site asks for. With all four character types on, each character adds about 6.4 bits:

Length	Strength	Good for
8 characters	About 51 bits, fair	Only where a site allows no more
12 characters	About 77 bits, strong	Everyday accounts
16 characters	About 103 bits, very strong	Email, banking, work
20 characters	About 129 bits, very strong	Password managers, Wi-Fi, anything important

How this one is made

The page asks your browser’s crypto.getRandomValues for random numbers, the same source used for encryption keys. Numbers that would make some characters slightly more likely than others are thrown away, so every character is equally likely. At least one character from each set you choose is included, then the order is shuffled.

The password exists only in this tab. It is not sent, logged or stored, and it is gone when you leave the page.

Keeping it

Do not try to remember random passwords; use a password manager such as the one built into your browser, Apple Passwords, Bitwarden or 1Password, and turn on two-step sign-in for important accounts. Copying a password puts it on your clipboard, so clear the clipboard afterwards on a shared computer: the clipboard viewer shows how.

Last checked October 2026.

Questions

Is this password generator safe?

Yes. Passwords are made in your browser with cryptographic randomness and are never sent or stored. You can disconnect from the internet and it still works.

How long should a password be?

At least 16 characters for important accounts. Length adds more strength than symbols do.

Is a 12 character password strong enough?

A random 12-character password with upper and lower case, digits and symbols is about 77 bits, which is strong for everyday accounts. Use 16 or more for email and banking.

What does entropy mean for a password?

It is the number of guesses needed, written as a power of two. 100 bits means 2 to the power of 100 guesses, which no computer can try.

What are look-alike characters?

Characters easy to confuse when reading: lower-case l, upper-case I, the digit 1, the letter O and zero. Avoid them if you will ever type the password by hand.

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On a Mac, it installs in about a minute with one line in Terminal.