Password Generator

Free Secure Password Generator

This password generator creates cryptographically secure random passwords using your browser's built-in crypto.getRandomValues() API — the same source of randomness used in encryption software and security tools. Unlike generators that use Math.random(), which is predictable and unsuitable for security purposes, every password created here is truly unpredictable.

Customize your password length from 4 to 128 characters and choose which character sets to include: uppercase letters, lowercase letters, numbers, and symbols. The "exclude ambiguous characters" option removes look-alike characters like 0, O, 1, l, and I — useful when you need to type a password manually rather than paste it.

What Makes a Strong Password?

Password strength comes down to two factors: length and character diversity. A 16-character password using all four character types has roughly 95^16 possible combinations — more than 10^31. That's beyond the reach of any brute-force attack with current technology. By contrast, an 8-character password using only lowercase letters has just 26^8 combinations, which modern hardware can crack in seconds.

Our strength meter calculates entropy — a measure of randomness measured in bits — and estimates how long a brute-force attack would take at 10 billion guesses per second. This represents a well-funded attacker using modern GPU hardware. For context, a 16-character password using all character types reaches roughly 105 bits of entropy and would take approximately 100 million years to crack. A simple 8-character lowercase password has just 37 bits of entropy and could be cracked in under a minute.

Security experts recommend using a unique password for every account, never reusing passwords, and using a password manager to store them. Generate a long, random password here and let your password manager handle the rest.