Password Generator

Generate strong, secure random passwords

Read the full guide

••••••••••••••••

Password Length: 16

864

Uppercase Letters (A-Z)Lowercase Letters (a-z)Numbers (0-9)Symbols (!@#$%^&*)

Exclude Similar Characters (i, l, 1, L, o, 0, O)Exclude Ambiguous Symbols

🔒 Security Tips

•Use passwords that are at least 12-16 characters long
•Never reuse passwords across different accounts
•Store passwords in a secure password manager
•Enable two-factor authentication (2FA) when available
•Change passwords regularly, especially for sensitive accounts

Generate cryptographically secure random passwords with customizable length (8-128 characters) and character types. Choose from uppercase letters, lowercase letters, numbers, and special symbols to create passwords meeting any security requirement. Real-time strength meter evaluates password entropy and provides instant feedback. Exclude similar-looking characters (i, l, 1, L, o, 0, O) to prevent transcription errors. All password generation uses your browser's cryptographically secure random number generator (CSPRNG)—passwords are never sent to servers, logged, or stored anywhere. Perfect for creating account passwords, WiFi keys, encryption passphrases, and API tokens. Follow security best practices: use unique passwords for each account, store in a password manager, and enable two-factor authentication.

Password strength is measured by entropy—the number of possible combinations an attacker must try. Entropy is calculated as log₂(character_pool^length). A password using 26 lowercase letters and 8 characters has 26^8 = 208 billion combinations (37.6 bits of entropy). Adding uppercase (52 characters) increases to 52^8 = 53 trillion (45.6 bits). Adding numbers (62 characters) gives 62^8 = 218 trillion (47.6 bits). Adding symbols (94 characters) yields 94^8 = 6 quadrillion (52.6 bits). Security experts recommend minimum 60-80 bits of entropy for strong passwords. A 12-character password with all character types has 95^12 = 540 sextillion combinations (79 bits)—would take a modern computer 17,000 years to crack by brute force. However, dictionary attacks exploit common words and patterns. 'Password123!' has high character diversity but low entropy because it's predictable. Random passwords like 'xK9$mP2#qL5@' are strongest. The first computer password system was implemented at MIT in 1961 for the Compatible Time-Sharing System (CTSS). Today, password breaches expose 555 million credentials annually (2023 data), making strong, unique passwords critical.

Online Account Registration

Create unique passwords for every website and service—email, banking, social media, shopping, streaming. Password reuse is the #1 cause of account takeovers. If one site is breached, attackers try those credentials on other sites (credential stuffing). 65% of people reuse passwords across multiple accounts.

WiFi Network Security

Generate strong WPA2/WPA3 passwords (8-63 characters) for home and business WiFi networks. Default router passwords are easily cracked—80% of WiFi hacks exploit weak passwords. A 16-character random password with mixed characters is virtually uncrackable. Change WiFi passwords every 6-12 months.

Database & System Administration

Create passwords for database root users, SSH keys, server admin accounts, and API tokens. System-level passwords should be 20+ characters with maximum complexity. Store in enterprise password managers (1Password, LastPass, Bitwarden) with team sharing and audit logs.

Encryption & File Protection

Generate passphrases for encrypted drives (BitLocker, FileVault), password-protected ZIP/RAR archives, PDF encryption, and PGP/GPG keys. Encryption passwords should be 16+ characters—shorter passwords can be cracked via brute force, rendering encryption useless.

Two-Factor Authentication Backup Codes

When enabling 2FA, services provide backup codes for account recovery. Generate and store additional secure passwords for backup authentication methods. Store backup codes in a password manager or encrypted file, never in plain text or email.

Temporary Access & Guest Accounts

Create temporary passwords for guest WiFi, shared accounts, or contractor access. Use strong random passwords even for temporary access—weak passwords can be exploited before expiration. Rotate temporary passwords weekly or after each use.

Our generator uses the Web Crypto API's crypto.getRandomValues() method, which accesses the operating system's cryptographically secure pseudo-random number generator (CSPRNG). Unlike Math.random() (predictable, not secure), CSPRNG uses entropy sources like hardware interrupts, mouse movements, and system noise to generate truly unpredictable values. The algorithm works as follows: (1) Define character pool based on selected options—lowercase (26 chars), uppercase (26), numbers (10), symbols (32), total 94 characters. (2) Generate random bytes using crypto.getRandomValues(new Uint8Array(length)). (3) Map each random byte to a character in the pool using modulo operation: char = pool[randomByte % pool.length]. (4) Repeat until desired length is reached. (5) Calculate entropy: bits = length × log₂(pool_size). For example, a 16-character password with all 94 characters has 16 × log₂(94) = 16 × 6.55 = 104.8 bits of entropy. The strength meter evaluates: Very Weak (< 40 bits), Weak (40-60), Fair (60-80), Good (80-100), Strong (100-120), Very Strong (> 120). Excluding similar characters (i, l, 1, L, o, 0, O) reduces transcription errors when manually typing passwords but slightly reduces entropy (87 characters instead of 94).

Example	xK9$mP2#qL5@wR8!	correct-horse-battery-staple	MyD0g$Name2023!
Entropy (Strength)	Very High (104 bits for 16 chars)	High (77 bits for 4 words)	Low-Medium (predictable patterns)
Memorability	Very Difficult (requires password manager)	Easy (memorable words)	Medium (personal info = risky)
Typing Speed	Slow (mixed case, symbols)	Fast (lowercase, hyphens)	Medium
Brute Force Resistance	Excellent (years to crack)	Good (if words are random)	Poor (dictionary + rule attacks)
Best Use Case	All accounts (with password manager)	Master password, disk encryption	Not recommended (too predictable)
Vulnerability	None (if truly random)	Dictionary attacks if common words	Social engineering, data breaches

Our password generator uses the Web Crypto API (window.crypto.getRandomValues), supported by all modern browsers: Chrome 11+ (2011), Firefox 21+ (2013), Safari 6.1+ (2013), Edge 12+ (2015), and all mobile browsers. The API provides cryptographically strong random values suitable for security-sensitive applications like password generation, token creation, and cryptographic key generation. Unlike Math.random() which uses predictable pseudo-random algorithms (Linear Congruential Generator), crypto.getRandomValues() accesses OS-level entropy sources that are computationally infeasible to predict. The generated passwords never leave your browser—no network requests, no server-side processing, no logging. You can verify this by opening browser DevTools Network tab and generating passwords—zero network activity. For maximum security, use generated passwords immediately and don't store them in browser autofill (use a dedicated password manager instead). The strength meter uses zxcvbn algorithm (developed by Dropbox) which evaluates patterns, common words, keyboard patterns (qwerty), dates, and repetition—not just length and character types.

Frequently Asked Questions

How long should my password be?

Minimum 12 characters for general accounts, 16+ for sensitive accounts (banking, email, work), and 20+ for system administration or encryption keys. Each additional character exponentially increases cracking time. A 12-character password with all character types (94 options) has 79 bits of entropy and would take 17,000 years to crack. A 16-character password has 105 bits and would take 9 million years. Length matters more than complexity—'correcthorsebatterystaple' (28 lowercase) is stronger than 'P@ss1!' (6 mixed).

Should I include special symbols in my password?

Yes, if the service allows it. Symbols increase the character pool from 62 (letters + numbers) to 94 (adding ~32 symbols), boosting entropy by 52% for the same length. However, some systems restrict symbols or have poor symbol support. If symbols cause login issues, prioritize length over complexity—a 16-character alphanumeric password is stronger than a 10-character password with symbols.

Is it safe to use a password generator?

Yes, if it's client-side (like ours). Our generator uses your browser's cryptographically secure random number generator (crypto.getRandomValues) and never sends data to servers. Avoid online generators that require server-side generation—you can't verify they're not logging passwords. To verify our tool: open browser DevTools → Network tab → generate password → confirm zero network requests. For maximum paranoia, disconnect from internet after loading the page.

Can I use the same strong password for multiple accounts?

Absolutely not! Password reuse is the #1 security mistake. When one site is breached (555 million credentials leaked in 2023), attackers try those credentials on other sites (credential stuffing). If you reuse passwords, one breach compromises all accounts. Use a password manager (1Password, Bitwarden, LastPass) to generate and store unique passwords for every account. The only password you should memorize is your password manager's master password.

What's better: a random password or a passphrase?

Random passwords (xK9$mP2#qL5@) are stronger per character but require a password manager. Passphrases (correct-horse-battery-staple) are memorable and strong if using 4-6 random words from a large dictionary (7,776+ words). Use random passwords for all accounts (stored in password manager) and a strong passphrase for your master password. Avoid passphrases with common phrases, song lyrics, or quotes—these are in cracking dictionaries.

How often should I change my passwords?

Modern security guidance: change passwords only when compromised, not on a schedule. Forced periodic changes lead to weak passwords (Password1, Password2, Password3). Instead: use strong unique passwords, enable 2FA, monitor breach notifications (haveibeenpwned.com), and change immediately if a service is breached. Exception: change every 6-12 months for high-security accounts (banking, work email) or shared passwords (WiFi, team accounts).

Should I exclude similar characters (i, l, 1, L, o, 0, O)?

Enable this option if you'll manually type the password frequently (WiFi password, shared account). Similar characters cause transcription errors—'Il1' and 'oO0' look identical in some fonts. However, excluding them reduces entropy slightly (87 vs 94 characters). If using a password manager with copy-paste, keep similar characters for maximum strength. For printed passwords (WiFi cards, emergency access), definitely exclude them.

What's the difference between this and my browser's password generator?

Browser password generators (Chrome, Safari, Firefox) are excellent and use similar cryptographic methods. Our tool offers more customization: adjustable length (8-128 vs browser's fixed 15-20), character type selection, similar character exclusion, and strength visualization. Use browser generators for convenience (auto-save, auto-fill) or our tool when you need specific requirements (WiFi passwords, API tokens, system passwords) or want to avoid browser password storage.