Random Password Generator
Cryptographically secure · Strength meter · Crack time · Passphrase mode · 100% Private
Generate Password
Click Generate →
Click the password or the copy button to copy to clipboard
Password Length
Include Characters
Options
Exclude Ambiguous Characters
Removes 0, O, 1, l, I — avoids look-alike confusion
No Repeating Characters
Every character in the password is unique
Exclude Specific Characters
Bulk Password Generator
Generate
passwords
Click Generate to create multiple passwords at once using your current settings.
Recent Passwords
Generated passwords appear here. Last 15 are saved during this session.
QR Code
Scan with your phone to transfer the password to your mobile device without typing.
Strong Password Tips
- ✓ Use 16+ characters — length is the single most important factor
- ✓ Mix uppercase, lowercase, numbers, and symbols
- ✓ Never reuse a password across different websites
- ✓ Use a passphrase (4+ random words) for accounts you type manually
- ✓ Store passwords in a password manager — never in a text file
- ✓ Enable two-factor authentication (2FA) on every account that supports it
Free Random Password Generator — Cryptographically Secure
Our random password generator uses crypto.getRandomValues() — the same Web Cryptography API used by browsers for SSL/TLS — to generate passwords. Unlike
Math.random(), which is predictable, cryptographic randomness is impossible to predict, making your passwords truly secure. Everything runs in your browser. Your passwords are never transmitted or stored anywhere.
Cryptographically Secure
Uses crypto.getRandomValues() — not predictable Math.random(). Same API used in SSL encryption.
Strength Meter
Real-time password strength score with entropy bits and estimated crack time for any attack scenario.
Passphrase Mode
Generate memorable word-based passphrases like "correct-horse-battery-staple" — long, secure, typeable.
Bulk Generate
Generate up to 50 unique passwords at once — ideal for IT admins, developers, and system setup.
QR Code Transfer
Scan the QR code with your phone to instantly transfer a generated password to your mobile device.
100% Private
All generation happens locally. Your passwords never leave your browser — no server, no logs, no tracking.
How Long Does It Take to Crack a Password?
The time required to crack a password depends on its length, character variety, and the attacker's hardware. Here's a reference based on modern GPU brute-force attacks (10 billion guesses/second):
| Password Example | Length | Charset | Crack Time |
|---|---|---|---|
password | 8 chars | Lowercase only | Instantly |
P@ssw0rd | 8 chars | Mixed + symbol | ~22 minutes |
kR7#mQpL | 8 chars | Full random | ~5 hours |
kR7#mQpL2w@ | 12 chars | Full random | ~34,000 years |
9xK#mQpL2w@v | 16 chars | Full random | ~92 billion years |
| correct-horse-battery-staple | 28 chars | Passphrase (4 words) | Trillions of years |
What Makes a Password Strong?
- Length (most important): Every additional character multiplies the number of possible combinations exponentially. A 16-character password is astronomically harder to crack than a 10-character one.
- Randomness (entropy): Human-chosen passwords follow predictable patterns. True cryptographic randomness means no patterns, no guessable sequences.
- Character variety: Using uppercase, lowercase, numbers, and symbols expands the charset from 26 to 95 possible characters per position.
- Uniqueness: If one site gets breached and you reused that password, every account with that password is compromised. Use a unique password for every account.
- No personal info: Birthdays, names, pet names, and phone numbers are guessed first in targeted attacks and found easily on social media.
Password vs Passphrase — Which Is Better?
Both are strong when generated correctly. The choice depends on your use case:
- Random password (e.g.
kR7#mQpL2w@v) — Maximum security per character. Best for accounts you never type manually and autofill with a password manager. - Passphrase (e.g.
correct-horse-battery-staple) — Longer overall, easier to type and remember. Ideal for your master password, device login, or accounts you type on TVs and game consoles. A 4-word passphrase is typically 25–30 characters and provides more entropy than a 10-character random password.
Frequently Asked Questions
Is this password generator truly random and secure?
Yes. This tool uses
window.crypto.getRandomValues() — the Web Cryptography API built into every modern browser. This is cryptographically secure pseudo-random number generation (CSPRNG), the same standard used in TLS/SSL encryption. It is fundamentally different from Math.random() which is predictable and unsuitable for security purposes.Are my passwords stored or sent to a server?
Never. Every password is generated locally in your browser using JavaScript. No data is transmitted to any server. We have no ability to see, log, or access your generated passwords. See our Zero Data Storage Policy.
How long should my password be?
Security experts recommend a minimum of 14–16 characters for a random password. At 16 characters with full character variety (upper, lower, numbers, symbols), a modern computer would take billions of years to crack it by brute force. For passphrases, 4–6 random words (typically 25–35 characters) provides equivalent or greater security while being easier to remember.
What is entropy and why does it matter?
Entropy measures the unpredictability of your password in bits. It's calculated as: entropy = length × log₂(charset size). A password with 80+ bits of entropy is considered very strong. Our strength meter shows entropy so you can see exactly how secure your password is, not just a vague "strong" label.
What is a passphrase and when should I use one?
A passphrase combines 4–6 random, unrelated words (e.g. "correct-horse-battery-staple"). Because it's very long, it's highly resistant to brute-force attacks. Because it uses real words, it's easier to type and remember than random characters. Use a passphrase for your device login password, password manager master password, or any account you type frequently on different devices.
How do I use the bulk password generator?
Set your desired password options (length, character types, etc.) in the generator above, then scroll to the Bulk Generator, set how many passwords you want (up to 50), and click Generate. All passwords use your current settings. Use "Copy All" to copy the full list to your clipboard, or copy passwords individually.
Is this tool free to use?
100% free. No sign-up, no subscription, no limits. Generate as many passwords as you need.