Generate cryptographically secure passwords instantly. Custom length, character sets, bulk generation. 100% offline — passwords never leave your device.
A strong password needs three things: length (minimum 16 characters), complexity (mixed uppercase, lowercase, numbers, and symbols), and randomness (not based on dictionary words, names, or patterns). The strength is measured in "bits of entropy" — a 20-character password using all character types has about 130 bits of entropy, which would take longer than the age of the universe to crack by brute force even with the most powerful computers. Avoid using the same password on multiple sites.
Storing passwords in your browser's built-in manager is generally safe for personal use, but a dedicated password manager like Bitwarden (open-source, free), 1Password, or Dashlane is significantly better. Password managers encrypt your vault, sync across devices, detect reused passwords, and alert you about data breaches. They can also auto-fill passwords, eliminating the risk of typing into phishing sites. For work environments, consider enterprise password managers like Keeper or LastPass Teams.
The minimum recommended length depends on the system: for email and banking accounts, use 20+ characters. For local system accounts, 16+ characters. For Wi-Fi passwords, 20+ characters. For low-risk accounts, 12 characters may suffice. NIST (US National Institute of Standards and Technology) recommends focusing on length over complexity — a 20-character lowercase-only password is harder to crack than an 8-character complex one. Most modern systems support passwords up to 64–128 characters.
This generator is safe because it works entirely in your browser — no passwords are sent to any server. You can verify this by opening browser DevTools → Network tab → you will see zero outbound requests when generating a password. The generation uses window.crypto.getRandomValues(), the same cryptographic API used by browser-based secure communications. Even if our website went down, the generation code already in your browser would continue to work offline.
Entropy measures how unpredictable a password is, expressed in bits. Formula: entropy = log2(charset_size^length) = length × log2(charset_size). Examples: 20 chars using 94 printable ASCII = 20 × log2(94) ≈ 131 bits. A password with 128+ bits of entropy is considered computationally infeasible to crack by brute force. Each additional character multiplies the search space by the charset size. This is why length matters most — each character adds the same entropy regardless of position.