Phần hướng dẫn bên dưới chưa có bằng tiếng Việt nên được hiển thị bằng tiếng Anh. Bản thân máy tính đã được dịch đầy đủ.
Cách sử dụng máy tính này
- Choose a length (16 or more characters is recommended).
- Choose which character types to include. At least one character of each selected type is guaranteed.
- Optionally avoid look-alike characters (I, l, 1, O, 0, o) for passwords you'll type by hand.
- Copy the password into your password manager.
Công thức
Password strength is measured as entropy: how many guesses an attacker would need on average. Each character drawn uniformly from a pool of N symbols adds log₂(N) bits.
Entropy = length × log₂(pool size)
20 characters from 88 symbols ≈ 129 bits
Câu hỏi thường gặp
Is this generator secure?
Yes. It uses the Web Crypto API (crypto.getRandomValues) with rejection sampling to avoid bias. Everything runs locally; the password never leaves your device.
How long should a password be?
Current guidance (such as NIST SP 800-63B) favours length. For accounts protected by a password manager, 16–20+ random characters is excellent.
Should I reuse passwords?
Never. Use a unique password for every account, store them in a password manager, and turn on two-factor authentication where available.