How do I generate a strong random password online?
Click Generate to create a cryptographically secure random password. Customize length (8-128 characters), and toggle uppercase, lowercase, numbers, and symbols. The tool shows a strength meter and entropy estimate. Passwords are generated locally — nothing is sent over the network.
Length: 20, All character types
K#9mV&pL2$xQ8nR!wZ5j
Password Generator
Generate strong, cryptographically secure random passwords.
How it works
- Passwords are generated using the
crypto.getRandomValues()Web Crypto API for cryptographic randomness. - Everything runs in your browser — no passwords are sent over the network.
- Strength is estimated from entropy (password length × log₂ of character pool size).
Tips & Best Practices
Length beats complexity for password strength
A 20-character lowercase password (26^20 = 10^28 combinations) is stronger than an 8-character password with mixed case, numbers, and symbols (95^8 = 10^15). Modern guidance from NIST (SP 800-63B) recommends minimum 15 characters and removing complexity requirements that lead to predictable patterns like P@ssw0rd!.
Use passphrases for memorable passwords
Four random dictionary words (correct-horse-battery-staple style) create passwords that are both strong and memorable. At ~12,000 common English words, four random words give 12000^4 = 2x10^16 combinations — equivalent to a 12-character random password but far easier to type and remember.
Excluding similar characters weakens your password less than you think
Removing ambiguous characters (0/O, 1/l/I) from a 16-character password reduces the character set from ~95 to ~88 — a negligible 7% reduction in entropy. The readability gain is worth it for passwords you might need to read aloud, type on a phone, or share verbally.
Browser crypto.getRandomValues() is the gold standard
Math.random() is not cryptographically secure — its output can be predicted. DevBolt uses crypto.getRandomValues(), which pulls from the OS entropy pool (CryptGenRandom on Windows, /dev/urandom on Linux). This is the same source used by OpenSSL and is suitable for generating passwords, tokens, and keys.
Frequently Asked Questions
How long should a secure password be in 2026?
What makes a password strong?
Is it safe to generate passwords in a browser?
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