Password Generator

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Frequently asked questions

Are passwords generated on your server?

No. Generation runs locally in your browser using crypto.getRandomValues for cryptographically strong randomness. Nothing is uploaded or logged by Roy's Tools.

What is entropy in bits?

Entropy is how unpredictable a password is, measured in bits. Each bit doubles the search space, so 80 bits means roughly 2^80 possible passwords. 80+ bits is a comfortable target for most personal accounts.

How is time to crack calculated?

We assume an offline attacker with a fast-hash setup at about 10 billion guesses per second and report the average time to find your password. Online attacks against a real service are typically billions of times slower.

Should I use a random password or a passphrase?

Both can be equally strong. Passphrases are easier to remember and type; random character passwords are shorter for the same entropy. Pick whichever you'll actually use without reusing.

Does length really beat complexity?

Usually yes. Adding two more random characters from a 70-symbol alphabet adds about 12 bits of entropy, which beats most complexity-rule tweaks. Aim for length first, complexity second.