Generate Strong Password Password

A strong password has high entropy, meaning it is unpredictable and cannot be guessed efficiently. Strength comes from three factors: length (more characters), character variety (larger character set), and randomness (no patterns or dictionary words). A 16-character password using all 95 printable ASCII characters, generated by a cryptographically secure random number generator, achieves roughly 105 bits of entropy.

Both are important and serve different purposes. A strong password protects against brute-force and credential-guessing attacks. Two-factor authentication protects against phishing, keylogging, and password database breaches. Using both creates defense in depth — even if one layer fails, the other still protects your account. Always enable 2FA when available.

Reputable password generators use the Web Crypto API (crypto.getRandomValues) in browsers or similar cryptographically secure pseudorandom number generators. This ensures each character is independently and uniformly selected. Avoid generators that use Math.random() in JavaScript, as it is not cryptographically secure and can produce predictable output.

It depends on how the site stores passwords. If they use a strong hashing algorithm like bcrypt or Argon2 with proper salting, a 16-character random password would take billions of years to crack even with the hash exposed. However, if the site uses weak hashing (MD5, SHA-1) or stores passwords in plaintext, even a strong password is immediately exposed. This is why unique passwords per site matter.