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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.

Strong 20-character password
Input
Length: 20, All character types
Output
K#9mV&pL2$xQ8nR!wZ5j
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Password Generator

Generate strong, cryptographically secure random passwords.

4128
StrengthVery Strong

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

Security Note

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!.

Pro Tip

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.

Common Pitfall

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.

Real-World Example

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?
A secure password should be at least 16 characters long. NIST SP 800-63B recommends a minimum of 8 characters, but security researchers recommend 16+ for important accounts. Each additional character exponentially increases the number of possible combinations — a 16-character password with mixed case, digits, and symbols has approximately 10^31 combinations, making brute-force attacks impractical. For maximum security, use 20+ characters or a passphrase (4-6 random words). DevBolt's Password Generator creates cryptographically random passwords using the Web Crypto API, ensuring true randomness.
What makes a password strong?
A strong password has three properties: length (16+ characters), randomness (not based on dictionary words, personal info, or patterns), and uniqueness (never reused across sites). Character diversity (uppercase, lowercase, digits, symbols) helps but length matters more — a 20-character lowercase password is stronger than an 8-character password with all character types. The strongest approach is using a password manager to generate and store unique random passwords for every account. Avoid common patterns like 'Password1!', keyboard walks (qwerty), or leetspeak substitutions (p@ssw0rd) — attackers check these first.
Is it safe to generate passwords in a browser?
Yes, when the tool runs client-side. DevBolt's Password Generator uses the Web Crypto API (crypto.getRandomValues) which provides cryptographically secure random numbers directly in your browser. No passwords are sent to any server. You can verify this by checking the Network tab in developer tools — zero requests are made during generation. The Web Crypto API draws from your operating system's entropy pool (the same source used by OpenSSL and other cryptographic software), making browser-generated passwords as secure as those from command-line tools.

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