Password Generator

Secure Random Password Generator

This password generator uses the Web Crypto API's crypto.getRandomValues() method — the same cryptographically secure random number generator used by browsers for TLS/SSL encryption. Unlike Math.random(), which is predictable and unsuitable for security purposes, this method provides true entropy suitable for generating passwords, tokens, and keys. You can configure the character set by toggling uppercase letters, lowercase letters, digits, and symbols. The exclude ambiguous option removes visually similar characters (i, l, 1, o, 0, O) to make passwords easier to read in print or on screen. The strength meter evaluates password entropy based on length and character pool size in real time.

Why Password Strength Matters

A strong password is your first line of defense against unauthorized access. The entropy of a password — measured in bits — depends on its length and the size of the character set used. An 8-character password with only lowercase letters has about 38 bits of entropy and can be cracked in seconds. A 24-character password with all character types has over 150 bits of entropy, making it effectively impossible to brute force even with massive computing clusters. This generator defaults to 24 characters with uppercase, lowercase, and digits enabled — providing an excellent balance of security and usability. For maximum security, enable symbols and increase the length to 40+ characters. All generation happens locally — your passwords never touch a network.