Check the strength of your existing password (never submitted to any server)
FAQ
📖 How to Use
- Set the desired password length using the slider.
- Check options: uppercase, lowercase, numbers, symbols.
- Click Generate Password.
- Click Copy to copy it to your clipboard, then store it in a password manager.
Password Generator — Creating Secure Passwords That Are Actually Hard to Crack
Despite two decades of password security guidance, "123456", "password", and "qwerty" remain among the most commonly used passwords worldwide every year. The reason isn't ignorance — it's that humans are genuinely bad at creating and remembering random, high-entropy strings. We default to patterns that are memorable but predictable: keyboard walks, common words with number suffixes, personal dates.
A cryptographically secure password generator solves this by using the operating system's random number generator (not a predictable algorithm) to create strings with genuine randomness. This tool generates passwords using the browser's crypto.getRandomValues() API — the same cryptographic-grade source used in SSL/TLS key generation — ensuring that the output has no exploitable pattern.
Password Entropy: Why Length Matters More Than Character Complexity
Password security is measured in entropy bits — the logarithm (base 2) of the number of possible passwords of that type. Higher entropy means more guesses required to crack the password by brute force:
| Password Type | Example | Entropy | Crack Time* |
|---|---|---|---|
| 8 lowercase letters | computer | 37.6 bits | Hours |
| 8 mixed + number + symbol | C0mput3r! | 52 bits | Years |
| 12 mixed + number + symbol | xK9#mQ2$rL7! | 78 bits | Millions of years |
| 16 fully random | Generator output | 104 bits | Heat death of the universe |
| 4-word passphrase | correct horse battery staple | 44 bits | Centuries (if truly random) |
*Crack time assumes 100 billion guesses/second (GPU cluster). Your actual security also depends on how the hash is stored by the service.
Password Security Best Practices
- Use a unique password for every account — password reuse is the primary reason a breach of one service leads to others being compromised; a credential stuffing attack simply tries breached username+password pairs across other sites
- Use a password manager — the only practical way to have unique 16+ character passwords for every site is to let a password manager (Bitwarden, 1Password, KeePassXC) remember them; you only memorise one strong master password
- Enable two-factor authentication (2FA) — even if your password is compromised, 2FA prevents login without your second factor (TOTP app or hardware key)
- Never store passwords in plaintext — not in notes apps, spreadsheets, browser bookmarks, or email drafts
- Check Have I Been Pwned — haveibeenpwned.com lets you check if your email or password has appeared in known data breaches
Is the Generated Password Stored Anywhere?
No. Password generation uses window.crypto.getRandomValues() to produce a cryptographically random output that is displayed in your browser and never transmitted anywhere. There is no server, no log, no database — the password exists only in your browser window until you close the tab.
Frequently Asked Questions
How long should a password be?
NIST guidelines (2024) recommend a minimum of 15 characters for passwords. For high-value accounts (email, banking, password manager master password), use 20+ characters. Length contributes more entropy than character complexity — "correcthorsebatterystaple" is stronger than "P@55w0rd!" even though the latter looks more complex.
Should I use the generated password as-is or modify it?
Use it as-is and store it in a password manager — do not modify it. When people modify randomly generated passwords to make them "more memorable," they invariably introduce patterns that reduce entropy. The whole point of a random generator is to produce something you couldn't predict yourself.
What is the difference between random and pseudorandom passwords?
Most computer-generated "random" numbers are actually pseudorandom — produced by deterministic algorithms that look random but aren't cryptographically secure. JavaScript's Math.random() is pseudorandom. crypto.getRandomValues() draws entropy from the operating system's true entropy pool (hardware events, timing variations) and is cryptographically secure — safe for password and key generation.
What password manager do you recommend for Pakistani users?
Bitwarden is the top recommendation: it's open source (audited code), free for personal use, has excellent browser extensions and mobile apps, and stores passwords in an encrypted vault. KeePassXC is a good offline alternative if you prefer no cloud storage. Avoid browser-built-in password managers for high-security accounts, as they're vulnerable to any malicious browser extension.
Why do some websites reject complex passwords with symbols?
Many poorly built websites have legacy restrictions on password characters — typically because their backend doesn't properly escape special characters, creating SQL injection or parsing risks. This is a security flaw in the website, not a reason to use a weaker password. If a site rejects your strong password, use letters and numbers only (still 16+ characters long). Report the restriction to the site's security team if possible.