The passwords people invent themselves tend to follow patterns: a familiar word, a capital letter at the start, a year and an exclamation point at the end. Password-cracking tools try exactly those patterns first. This generator removes the human element by picking every character at random from the sets you choose, so the result has no structure for an attacker to guess.
Generation happens locally in your browser using the Web Crypto API, the cryptographically secure random source built into modern browsers. The passwords are never sent to a server, logged or saved, and they disappear the moment you close the page. You can create a single password for a new account or up to 100 at once, with any length from 12 to 128 characters.
How to use: Strong Random Password Generator
- Enter a Password length between 12 and 128; 16 or more is a good default.
- Set Count if you need several passwords at once (up to 100).
- Keep Lowercase letters (a–z), Uppercase letters (A–Z), Digits (0–9) and Symbols (! @ # …) checked unless a site forbids one of them.
- Tick Exclude look-alike characters (I l 1 O 0 o) if the password will be read aloud or typed by hand.
- Select Generate strong password, then select Copy and save it straight into your password manager.
Example: Length 20 with all four character sets gives a random password of roughly 128 bits of entropy.
How to create a strong password: length beats complexity
Password strength is measured in entropy, the number of guesses an attacker would need, expressed in bits. Each random character adds log2 of the pool size. With all four sets enabled, the pool here holds 85 characters, worth about 6.4 bits each. A 12-character password lands near 77 bits, a 16-character password near 102 bits, and 20 characters reaches about 128 bits.
Notice what moves the number most. Adding one more character type grows the pool a little; adding four more characters multiplies the guessing work by tens of millions. So when a site limits which symbols you can use, simply make the password longer.
- 12 characters: the minimum this tool allows, fine for low-value accounts.
- 16 characters: a solid everyday choice for email, shopping and social accounts.
- 20 or more: banking, password manager vaults, admin and server accounts.
What makes this generator trustworthy
Every character comes from crypto.getRandomValues, not the predictable Math.random function. Characters are mapped with rejection sampling, so none appears more often than another. The tool also guarantees at least one character from each set you select, then shuffles the whole password so those guaranteed characters do not sit in predictable positions.
Turning on the look-alike filter removes I, l, 1, O, 0 and o. That trims the pool to 79 characters, a tiny loss of about 0.1 bit per character that one extra character more than makes up for.
Common password mistakes to avoid
A perfect random password still fails if it is handled carelessly. Watch out for these habits:
- Reusing one password across sites, so a single breach unlocks every account.
- Saving passwords in a plain notes app, spreadsheet or email draft.
- Making small edits to an old password instead of generating a fresh one.
- Relying on a password alone where two-factor authentication is available.
Frequently asked questions
Is it safe to use an online password generator?
It is safe when the password never leaves your device, and that is how this tool works. The password is created by JavaScript in your own browser using the Web Crypto API, and no request containing it is sent to any server. For extra assurance, load the page, disconnect from the internet and generate: it keeps working offline.
How long should my password be?
For most accounts, 16 random characters is a comfortable minimum, giving about 100 bits of entropy with all character sets enabled. For your password manager, email or bank, 20 characters or more is a better target. Because you will store it in a password manager rather than memorize it, a longer password costs you nothing.
Is a 16 character password strong enough?
Yes, when it is truly random. A 16-character password drawn from letters, digits and symbols has roughly 102 bits of entropy, far beyond what offline cracking rigs can brute-force. The weak point is usually reuse or phishing, not length, so give every account its own password and turn on two-factor authentication.
What does "Exclude look-alike characters" do?
It removes characters that are easy to confuse in many fonts: capital I, lowercase l, the digit 1, capital O, the digit 0 and lowercase o. Use it when a password will be typed from a printout, read over the phone or entered on a TV or console. The strength loss is tiny and easily offset by one extra character.
A website rejects my password. What should I do?
Some sites cap the length or ban certain symbols. Check the error message, then lower the Password length to the allowed maximum or uncheck Symbols (! @ # …) and regenerate. To keep the same strength without symbols, add three or four characters. The tool always includes at least one character from every set you leave checked.
Can I generate many passwords at once?
Yes. Set Count to any number up to 100 and each password appears on its own line. This is handy for provisioning test accounts, Wi-Fi guest passes or temporary credentials. You can copy the whole list or download it as a text file, but delete that file once the passwords are safely stored where they belong.