Password Generator
Generate strong, random passwords with custom length, uppercase, lowercase, numbers, and symbols. Copy with one click.
Cryptographically secure.
This generator uses crypto.getRandomValues() — a cryptographically secure random number generator built into your browser. Passwords are never sent to a server.
The Cryptographic Need for Strong Passwords
In the digital age, cybersecurity begins with password strength. Weak, easily guessable passwords (such as "password123" or birth dates) make you vulnerable to brute-force attacks and credential stuffing, where automated scripts test millions of common character combinations against user accounts. A secure Password Generator creates high-entropy, random strings that are virtually impossible for hackers to decrypt.
Understanding Password Entropy and Length
Password security is measured in "entropy bits"—a mathematical representation of the password's unpredictability. Entropy depends on two main factors: character length and the size of the character pool. A password that includes uppercase letters, lowercase letters, numbers, and symbols has a pool size of 94 possible characters. A 16-character password chosen randomly from this pool yields 94¹⁶ combinations, requiring billions of years of modern computing power to guess.
Best Practices for Securing Your Accounts
To maximize security, always follow these rules: (1) Use unique passwords for every account so a single breach does not compromise multiple services. (2) Make passwords at least 12–16 characters long. (3) Avoid incorporating personal information, dictionary words, or repeating keyboard patterns. (4) Use a secure password manager to store and autofill your generated credentials, enabling you to use complex keys without needing to memorize them.
Frequently Asked Questions
Yes. All passwords are generated entirely in your browser using the Web Crypto API (crypto.getRandomValues()), which uses cryptographically strong randomness. No passwords are ever sent to a server, logged, or stored externally. The only copy of your generated password exists on your screen.
A strong password has: (1) length of at least 12–16 characters, (2) a mix of uppercase letters, lowercase letters, digits, and symbols, (3) no common words or patterns, and (4) no personal information like birthdays or names. Each additional character type and length increases the number of possible combinations exponentially.
With a pool of 95 printable ASCII characters (26 uppercase + 26 lowercase + 10 digits + 33 symbols), a 16-character password has 95¹⁶ ≈ 4.4 × 10³¹ possible combinations. At 1 trillion guesses per second, it would take approximately 1.4 × 10¹ years (longer than the age of the universe) to crack by brute force.
Yes, strongly recommended. Password managers (like Bitwarden, 1Password, or KeePass) securely store unique, complex passwords for each site. They encrypt your vault with a single master password and can auto-fill credentials. This means you only need to remember one strong master password instead of dozens.
If you reuse the same password and one website is breached, attackers will try your email+password combination on other popular sites (a technique called credential stuffing). Having a unique password for every account ensures that a breach on one site cannot compromise your other accounts.