Password & Passphrase Generator

This free password generator creates strong, random passwords entirely in your browser. As a random password generator and secure password generator, it uses the Web Crypto API to generate cryptographically unpredictable passwords — set your length and character types, then generate a new one in a single click. Use it to create a password for any account without ever sending data to a server.

Why Is a Strong Password Necessary?

Weak passwords are vulnerable to common cyberattacks such as brute-force, dictionary attacks and credential stuffing. Predictable passwords like "123456", "password" or a date of birth can be cracked in seconds. Strong password generation is built on randomness, length and character variety.

The vast majority of data breaches worldwide stem from weak or reused passwords. Services like haveibeenpwned.com contain billions of leaked passwords; those on the list are tried by automated tools across all popular sites. That is why using a unique, random and complex password for every account is no longer optional but essential.

This tool makes strong password generation cryptographically secure. Passwords produced with the Web Crypto API reach an entropy level that would require billions of years of computation to break by trying all combinations. A 16-character mix of uppercase + lowercase + numbers + symbols provides about 103 bits of entropy.

Criteria for a Strong Password

The core rules for creating a strong password are:

• Length: Use at least 12 characters for personal accounts and 16-20 for critical accounts (email, banking, work). Length provides more security than character variety.
• Character variety: A mix of uppercase (A-Z), lowercase (a-z), numbers (0-9) and symbols (!@#$%^&*) increases the password's key space exponentially.
• Randomness: Predictable patterns like "P@ss1234" are far weaker than fully random passwords. This tool uses cryptographic randomness.
• Uniqueness: Use a different password for every platform and account. A password leaked from one platform can be used to access others.
• Rotation: For especially sensitive accounts, renew passwords every 6-12 months. With this tool you can create a new strong password in seconds.

Mandatory periodic password changes are no longer recommended by NIST (the US National Institute of Standards and Technology). According to NIST guidelines, a strong, unique password does not need to be changed unless a breach occurs. However, if you suspect your password has been leaked, you should change it immediately.

Password Strength and Entropy: How Secure?

The strength indicator in this tool is based on entropy. Entropy expresses how hard a password is to crack in bits. The formula is: Entropy = log₂(charset_size^length). In other words, the larger the character set and the longer the password, the more computing power is needed to try all possibilities. Today's fastest GPU-based cracking tools can try billions of combinations per second, so low-entropy passwords pose a real risk. The table below shows entropy values for different password structures:

How This Generator Keeps Your Password Private

Everything happens in your browser. The password is generated using window.crypto.getRandomValues(), a cryptographically secure random source, and is never transmitted to any server. There is no logging, no analytics on the value, and no storage — once you leave the page, the password is gone from memory. This client-side approach means you can safely generate passwords even on a shared network.

Storing and Managing Your Passwords

Generating a strong password is only half the job; storing it safely is just as important. The most reliable approach is a dedicated password manager such as Bitwarden, 1Password or KeePass, which encrypts your passwords and lets you use a different one for every site without memorizing them. Avoid writing passwords in plain text files, browser notes or spreadsheets. Combined with two-factor authentication (2FA), a strong unique password is the single most effective step you can take to protect your online accounts.

Passwords vs Passphrases

A passphrase is a password made of several random words, such as "correct-horse-battery-staple". Because it is long, a four-to-five word passphrase can be both very strong and far easier to remember than a random string of symbols. A random character password (what this generator produces by default) packs the most entropy per character and is ideal when a password manager stores it for you; a passphrase is a great choice for the few passwords you must type by hand, such as your master password.

• Random character password: highest entropy per character, best stored in a manager — for example, a 16-character mix gives ~105 bits.
• Passphrase: easier to type and recall; four random common words already reach ~52 bits, and five words push well beyond 60 bits.

Whichever you choose, length and true randomness are what matter — never build a passphrase from a famous quote or song lyric, as those are in attackers' wordlists.

How to Create a Password in 3 Steps

Using this free password generator to create password strings takes only a few seconds:

1. Set the length: choose 12+ for everyday accounts, 16-20 for critical ones, using the slider.
2. Pick character types: enable uppercase, lowercase, numbers and symbols as required by the site.
3. Generate and copy: click to generate a password, check the strength bar, then copy it straight into your password manager.

Because it is a fully free password generator that runs in your browser, you can create as many unique passwords as you need, for as many accounts as you have, at no cost and with nothing ever leaving your device.