Generate secure, random passwords instantly with this free password generator online. Customize length, character types, and see real-time entropy calculations -- all processed locally in your browser with nothing sent to a server.
This password generator uses the Web Crypto API (crypto.getRandomValues) built into your browser to produce cryptographically secure random values. It maps those random bytes to your selected character set -- uppercase, lowercase, digits, and symbols -- to build each password. Because it relies on the browser's built-in cryptographic random number generator, the output is suitable for real-world use.
Entropy measures the randomness of a password in bits. It is calculated as length multiplied by log2(pool size), where pool size is the number of possible characters. A 16-character password using all character types (95 possible characters) has about 105 bits of entropy. Security experts recommend at least 80 bits for important accounts. Higher entropy means exponentially more guesses are required to crack the password by brute force.
A strong password is long (at least 12 characters), uses a mix of character types (uppercase, lowercase, numbers, symbols), and is randomly generated rather than based on dictionary words or personal information. The single most impactful factor is length -- each additional character multiplies the number of possible combinations. A randomly generated 16-character password with all character types is effectively uncrackable with current technology.
Yes. This generator runs entirely in your browser. No passwords are transmitted to any server, stored in any database, or logged anywhere. The source code is visible in your browser's developer tools so you can verify this yourself. It uses the same crypto.getRandomValues API that browsers use internally for TLS and other security functions, making the randomness suitable for production passwords.