Strong Password Generator
Generate long random passwords using the browser's cryptographically secure random source. 16–64 characters with mixed case, digits, and symbols.
About Strong Password
A strong password in 2026 means length first, character variety second. This generator produces 16–64 character random passwords drawn from the full ASCII printable alphabet (uppercase, lowercase, digits, and symbols by default), with every character sampled from crypto.getRandomValues — the browser's cryptographically secure PRNG, seeded by your operating system's entropy pool. No Math.random shortcuts that would make the output predictable. What makes a password "strong": entropy, measured in bits. A 16-character password from a 95-character alphabet has ~105 bits of entropy, which is more than any realistic brute-force attack can crack. 20 characters gives 131 bits; 32 gives 210. For reference: a 12-character password is weak enough that GPU farms can crack common variants in days, while a 16-character random password would take billions of years on the same hardware. The length gap matters; the symbol variety matters less than people think. Use strong random passwords only with a password manager. A 20-character random string is unforgettable by design — it exists to be pasted into a password field and forgotten until the manager autofills it next. For accounts you must type by hand (your password manager's master password, device login, some VPNs), use the memorable variant instead.
Features
- Generate cryptographically secure random passwords
- Customize password length and character types
- Include uppercase, lowercase, numbers, and symbols
- Generate multiple passwords at once
How to Use
- Set your desired password length using the slider
- Toggle character types (uppercase, lowercase, numbers, symbols)
- Click "Generate" to create secure passwords
- Click any password to copy it to your clipboard
Frequently Asked Questions
How long should a strong password be in 2026?
16 characters minimum, 20+ for anything important. GPU-based cracking speed has roughly doubled every two years for 15 years, so old rules ("8 characters is plenty") are obsolete. Length buys far more security than adding symbols: a 20-char lowercase password beats a 10-char password with all ASCII.
Is Math.random good enough for password generation?
No. Math.random is a pseudorandom generator with limited internal state; its output is deterministic once a few samples leak. An attacker seeing 3–4 passwords from the same generator can predict the rest. This tool uses crypto.getRandomValues, which pulls from the OS CSPRNG used for TLS keys.
Do I need to memorise a strong random password?
No — that's the point. Random strings this long are unforgettable by construction. Store them in a password manager (1Password, Bitwarden, KeePass, Apple Passwords) and autofill. The only password you should memorise is your password-manager master — use a memorable passphrase for that one.
Should I rotate strong passwords regularly?
Only after a known breach. NIST dropped mandatory periodic rotation in SP 800-63B because it encourages users to pick weaker, predictable variations (Password1!, Password2!). A 20-char random password that hasn't leaked is strong indefinitely.
Other Password Generator variants
Memorable Passphrase
Generate easy-to-remember 4–8 word passphrases joined by hyphens. Diceware-inspired, crypto-random word selection, strong against brute-force.
Random PIN
Generate random numeric PINs for phone locks, 2FA backup codes, safes, and debit cards. Crypto-random digit selection with rejection sampling.