Password Generator - Strong Random Password & UUID Generator

Password strength is not about looking complicated but about how many guesses an attacker needs. It is measured as entropy in bits, and every extra bit doubles the number of guesses. “P@ssw0rd2026” has upper and lower case, digits and a symbol, yet it is a common word with predictable substitutions that cracking tools try within seconds. A truly secure password must be generated randomly and be long enough.

This tool uses the browser’s cryptographic crypto.getRandomValues, not the predictable Math.random. Random mode creates 6 to 64 characters from upper case, lower case, digits and 26 common symbols, and guarantees at least one character from every selected set. With everything ticked the pool is about 88 characters, roughly 6.46 bits each, so 16 characters give about 103 bits, far beyond current brute-force capability. You can also exclude look-alike characters such as 1, l, I, 0, O and o for easier typing.

Diceware passphrase mode picks 3 to 8 random words from a built-in list and joins them with hyphens, which is easy to remember and type. To be honest, the built-in list has only 96 words, about 6.58 bits per word, so 8 words give about 53 bits, clearly weaker than a random password of similar length. Use passphrases for things you must memorize, such as a computer login or Wi-Fi password. For important accounts like email, online banking and cloud storage, use random mode with 16+ characters and a password manager.

The tool shows a strength rating and estimated cracking time based on entropy, and can generate 1, 5 or 10 passwords at once. Even a strong password fails if reused: when one site leaks, attackers try the same password everywhere. Use a different password for every site and turn on two-factor authentication. Passwords are generated in your browser and are never sent or logged.