How Secure Passwords Work
A strong password is the first line of defence for any online account. Its security depends on two key factors: length and character diversity. The longer a password and the larger its character pool, the exponentially harder it becomes to crack — even for modern hardware running billions of guesses per second.
Password strength is measured in entropy bits. Entropy is calculated as
length × log₂(pool size). A password with 60+ bits of entropy is considered
strong; 80+ bits is excellent for most purposes.
Why You Should Use a Password Generator
- Avoid patterns — Humans tend to choose predictable words, dates, or sequences. Generators eliminate bias.
- Maximise randomness — Every character is chosen independently from the full pool.
- Instant uniqueness — A different strong password for every account reduces breach impact.
- No memorisation needed — Store generated passwords in a trusted password manager.
Password Strength Guide
- Weak — Short, single character type. Crackable in seconds.
- Medium — Moderate length or two character types. May resist casual attacks.
- Strong — Good length (12+) with 3–4 character types. Resists most attacks.
- Very Strong — Long (16+) with full character diversity. Extremely resistant.
Tips for Password Safety
- Use a unique password for every account.
- Store passwords in a reputable password manager (e.g. Bitwarden, 1Password).
- Enable two-factor authentication (2FA) wherever possible.
- Never share passwords via email, SMS, or chat.