The Free Password Generator
Generate secure, random passwords in seconds. Choose your length, character sets, and strength — 100% client-side. Your passwords never leave the browser.
What makes a strong password?
A strong password is one that is hard to guess or brute-force. The two biggest factors are length and character set size — together they determine entropy, measured in bits. Every extra character multiplies the number of possible combinations exponentially. A 16-character password using all four character sets (uppercase, lowercase, numbers, symbols) has a character pool of 94, yielding over 80 bits of entropy — effectively uncrackable with current hardware.
Equally important is randomness. Human-chosen passwords follow patterns — names, dates, dictionary words, keyboard walks — which attackers exploit with dictionaries and rule-based attacks. This generator uses crypto.getRandomValues(), the same cryptographically secure random source used by TLS and operating system key generation, ensuring every character is truly unpredictable.
// Entropy formula entropy = log2(charsetSize ^ length) // Example: 16 chars, 94-char pool (all sets) entropy = log2(94^16) ≈ 105 bits → Excellent // Example: 8 chars, numbers only (10-char pool) entropy = log2(10^8) ≈ 26 bits → Weak
Generate your password in seconds
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1
Choose your length
Drag the Length slider to set how many characters your password should have. 16 characters is a good default for most accounts; use 20+ for high-value targets like email or banking.
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2
Select character sets
Tick the character set checkboxes to include uppercase letters, lowercase letters, numbers, and symbols. More sets = larger pool = higher entropy. Enable "Exclude ambiguous characters" if you need to type the password manually.
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3
Click Regenerate or wait
Passwords generate automatically whenever you change any setting. Hit Regenerate anytime you want a fresh batch. The strength bar and entropy value update in real time.
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4
Copy your password
Each generated password has its own Copy button. Click it to copy the password to your clipboard — the button briefly confirms with a checkmark. Use a password manager to store it securely.
Frequently asked questions
Is this password generator really free? +
Yes, completely free, no account needed, no limits.
Are my passwords safe? +
Passwords are generated in your browser using the Web Crypto API (crypto.getRandomValues). They never leave your device and are never transmitted anywhere.
What makes a password strong? +
Length (12+ chars), mix of uppercase, lowercase, numbers and symbols, no dictionary words. Entropy above 60 bits is considered strong.
What is password entropy? +
Entropy measures how unpredictable a password is, in bits. Higher entropy = harder to crack. A password with 80+ bits of entropy would take billions of years to brute-force.
Should I exclude ambiguous characters? +
Optional — excluding 0, O, 1, l, I helps avoid confusion when reading passwords aloud or typing manually.
Can I generate multiple passwords at once? +
Yes, generate up to 10 passwords at once and copy any of them individually.
What character sets should I use? +
Use all four (uppercase, lowercase, numbers, symbols) for maximum security. Some services restrict symbols — adjust as needed.
How often should I change passwords? +
Security experts now recommend changing passwords only when there is reason to believe they have been compromised, and using a password manager to maintain unique passwords per service.