Password Generator

Strong Password Generator

Our Password Generator creates cryptographically secure random passwords directly in your browser. Unlike many online password generators that send your preferences to a server and return a generated password, our tool uses the Web Crypto API's crypto.getRandomValues() function, which is the same cryptographically secure random number generator used by banks and governments. Your passwords are generated locally on your device and never transmitted over the network. This makes our generator safe for creating passwords for your email, bank, cryptocurrency wallets, and other high-value accounts.

What Makes a Password Strong?

Password strength is determined by two factors: length and entropy (randomness). A 16-character password using uppercase, lowercase, numbers and symbols has approximately 95^16 = 4.4 × 10^31 possible combinations - that's more than the number of stars in the observable universe. Even a supercomputer capable of guessing 1 trillion passwords per second would need about 1.4 million years to brute-force such a password. In contrast, an 8-character password from the same character set has only 95^8 = 6.6 × 10^15 combinations, which a modern GPU can crack in a few hours.

Recommended Password Length

• 12 characters: Minimum acceptable for low-value accounts (forums, social media with 2FA enabled). Crack time: ~3 weeks on a fast GPU.
• 16 characters: Recommended for most accounts including email and banking. Crack time: ~1.4 million years.
• 20 characters: Strongly recommended for password manager master passwords and cryptocurrency wallets. Crack time: ~14 billion years.
• 24+ characters: For ultra-sensitive accounts (root admin, cold storage wallets). Effectively uncrackable.

Common Password Mistakes to Avoid

• Reusing passwords: If one site gets breached, attackers try the same password on your other accounts (credential stuffing). Use a unique password for every account.
• Using personal info: Names, birthdays, pet names and phone numbers are easily found on social media. Avoid them entirely.
• Dictionary words: "Password123", "LetMeIn", "Qwerty" - all are in every cracking dictionary within milliseconds.
• Substituting numbers for letters: "P@ssw0rd" is just as easy to crack as "password" because crackers try these substitutions by default.
• Short passwords: Anything under 12 characters is crackable within days on modern hardware.
• Storing passwords in plain text files: Use a password manager like Bitwarden, 1Password, or KeePass instead.

How Our Generator Works

When you click "Generate Password", our tool performs the following steps:

1. Builds a character pool based on your selections (uppercase, lowercase, numbers, symbols, with optional exclusion of ambiguous characters like 0, O, 1, l, I).
2. Uses window.crypto.getRandomValues() to generate cryptographically secure random numbers. This is the same algorithm used by TLS for HTTPS connections.
3. Maps each random byte to a character in the pool, ensuring uniform distribution (no bias toward certain characters).
4. Verifies that at least one character from each selected set is present. If not, regenerates.
5. Calculates entropy in bits (log2(pool_size^length)) and estimates crack time assuming 1 trillion guesses per second.
6. Displays the password and strength assessment. The password is shown in plain text so you can see and copy it - we do not store it anywhere.

Understanding the Strength Meter

Our strength meter is based on entropy (in bits), not just length. A 16-character password with only lowercase has 75 bits of entropy, while a 16-character password with all four character sets has 105 bits. Higher entropy = exponentially harder to crack:

• Red (Weak): Under 50 bits. Crackable in hours to days.
• Orange (Fair): 50-70 bits. Crackable in months to years.
• Yellow (Good): 70-90 bits. Crackable in centuries.
• Light Green (Strong): 90-110 bits. Crackable in millions of years.
• Dark Green (Very Strong): 110+ bits. Effectively uncrackable.

Best Practices for Password Security

• Use a password manager (Bitwarden, 1Password, KeePass, Dashlane) to generate and store unique passwords for every account.
• Enable two-factor authentication (2FA) wherever possible. Use an authenticator app (Authy, Google Authenticator) over SMS.
• Generate a strong master password for your password manager (20+ characters, all character sets).
• Never share passwords via email, chat, or text. Use a secure sharing feature in your password manager.
• Check if your email has been in a breach at HaveIBeenPwned.com and change any compromised passwords immediately.
• Avoid using public WiFi for logging into sensitive accounts without a VPN.

Privacy Guarantee

This password generator runs 100% in your browser. No password you generate here is ever sent to our servers, stored in our database, or logged anywhere. The "Recent" history feature is purely client-side and disappears the moment you close the tab. You can verify the privacy by opening Developer Tools (F12) → Network tab and watching for any network requests while generating passwords - you'll see none. We do not use cookies, analytics, or tracking scripts on this page.