Random and Strong Password Generator (Multiple)

What the generator does

The page builds passwords from four optional character sets: uppercase letters, lowercase letters, numbers and symbols. You choose how long each password should be and how many passwords you need. The tool then fills the output with random selections from the combined pool.

Two exclusion switches help with real-world forms. Exclude similar characters removes characters such as i, l, 1, L, o, 0 and O that are easy to confuse when read aloud or copied by hand. Exclude ambiguous characters removes brackets, slashes, quotes and other punctuation that some login forms reject or that can break when pasted into a script.

The generator always requires at least one character set. If you uncheck every set, it warns you and restores the last choice instead of producing an empty password.

The controls explained

• Password length: the slider and number box stay in sync between 4 and 128 characters. Longer passwords generally add more combinations, but the site's own maximum length still applies.
• Uppercase: adds A–Z. Useful when a form requires at least one capital letter.
• Lowercase: adds a–z. This is the base set most people expect.
• Numbers: adds 0–9. Some forms require a digit even when symbols are allowed.
• Symbols: adds punctuation such as !@#$%^&*()_+. Check the target site's rules before choosing this set.
• How many passwords: accepts 1 to 500. A batch is written one per line in the text area.

The single-password view shows one large result with a strength bar. When the count is greater than one, the page switches to a text area so you can copy the whole list at once.

How to generate a password

1. Set the length you need. Sixteen characters is a reasonable default for a unique account password; use more when the site allows it.
2. Keep uppercase, lowercase and numbers selected, then decide whether symbols are accepted by the form.
3. Turn on the exclusion options only if you have a reason. They shrink the pool, so compensate with a little more length.
4. Choose the number of passwords. Use one for a single account, or a batch when you are setting up several accounts at once.
5. Click Regenerate until you have a result you are happy with, then click Copy Password or select the text manually.
6. Store the password in a password manager before you close the page. The tool does not keep a copy.

How the strength estimate works

The strength bar estimates entropy from the password length and the number of possible characters in the selected pool. A short password made from a small pool is labelled weak. A longer password made from several sets moves through fair and good toward strong. The label is a rough guide because it does not know whether the password is unique, whether the site stores it safely, or whether an attacker already has it from a breach.

Entropy is not the only thing that matters. A password that is long but reused on ten sites is still a liability. A password that is strong but written on a sticky note beside the screen is also exposed. Use the generated value as one part of a wider habit: unique passwords per account, a manager, and multi-factor authentication where available.

Randomness and sensible limits

In modern browsers the generator uses crypto.getRandomValues to fill an array of random values, then maps those values into the selected character pool. If that browser API is unavailable, it falls back to Math.random. The browser API is the better source, but this page is still a general-purpose utility rather than a certified hardware security module.

For high-value accounts, use a reputable password manager's generator and let the manager store the result. For everyday sign-ups, a locally generated random string is a large improvement over a reused phrase or a predictable pattern.

Some sites impose unexpected rules: no symbols, a maximum length of 12, no repeating characters, or a requirement that the password not contain your username. Read the form's rules first. It is easier to generate a compliant password than to fight a validation message after several attempts.

Privacy and what not to do

Passwords are created in the browser and are not submitted to Newisty. The page does not ask for an email address, does not create an account and does not display a saved history. Copying a password places it on your clipboard, where other apps on your device may be able to read it, so clear the clipboard after pasting if that matters to you.

Do not use the same generated password on more than one account. Do not send a password through chat or email. Do not paste a real password into a page you do not trust just to test its strength. If you suspect a password has been exposed, change it and revoke active sessions rather than generating a replacement for the same compromised account.

Password managers, passphrases and recovery

A generated string is only useful if you can retrieve it later. A password manager stores the value, fills it into the right site and lets you copy it on a new device. The manager's master password should be long, unique and memorable; the generated passwords inside the vault can be random because you do not need to memorize them.

Some people prefer a passphrase made of several unrelated words. A passphrase can be easier to type and remember, but it still needs enough length and it must not be reused. This generator produces character-based passwords, not word-based passphrases, so use a dedicated passphrase tool if that is your preferred style.

Plan for recovery before you need it. Add a recovery email or backup codes to important accounts, keep them somewhere separate from the password itself, and enable multi-factor authentication. If a site offers only SMS recovery, treat the phone number as part of your security perimeter and keep it up to date.

When you replace a password, change it everywhere it was reused, then revoke active sessions. A new password on one site does not invalidate an old session that an attacker already opened. For email and banking, check recent activity and security alerts after the change.

Frequently Asked Questions