Generate Secure Passwords Instantly
Create strong, random passwords with customizable options. Powered by Web Crypto API. 100% free and private.
About This Tool
This Password Generator creates cryptographically secure random passwords using the Web Crypto API — specifically the crypto.getRandomValues() method, which provides a CSPRNG (Cryptographically Secure Pseudo-Random Number Generator) built into your browser. Unlike Math.random(), which uses a predictable algorithm that can be reverse-engineered, the Web Crypto API draws entropy from your operating system's secure random source (/dev/urandom on Linux/macOS, BCryptGenRandom on Windows), making the generated passwords truly unpredictable.
Password strength is fundamentally about entropy — the number of bits of randomness in the password. Entropy is calculated as log2(N^L), where N is the size of the character set and L is the password length. A 16-character password using uppercase, lowercase, numbers, and symbols (95 possible characters) has approximately 105 bits of entropy, which would take billions of years to crack with current technology. NIST Special Publication 800-63B recommends a minimum of 8 characters, but security researchers widely recommend 16 or more characters for accounts that matter.
The tool guarantees that at least one character from each selected category appears in every password by reserving the first positions for required characters, then filling the rest randomly from the full character set. A Fisher-Yates shuffle (also using crypto.getRandomValues for randomness) ensures the required characters are distributed unpredictably throughout the password, preventing any positional bias that could weaken security.
For practical use, a 16-character password with all character types enabled is strong enough for virtually any purpose. For master passwords or high-value accounts, consider 20+ characters. The bulk generation feature is useful for provisioning multiple accounts or creating unique passwords for a team. Every password is generated entirely in your browser — nothing is transmitted over the network, logged, or stored anywhere. Once you navigate away from this page, the generated passwords exist only where you have copied or saved them.
Password Options
Bulk Generation
📖 Complete Guide to Password Security (2026)
Learn about 2FA, password managers, and how to protect yourself from data breaches.
Learn More
A strong password is one that is difficult for both humans and computers to guess. The strength of a password depends on three main factors: length (at least 12 characters), complexity (mix of uppercase, lowercase, numbers, and symbols), and unpredictability (not based on dictionary words, personal information, or common patterns). Modern password-cracking tools can test billions of combinations per second, making short or simple passwords vulnerable. A truly random 16-character password with mixed character types would take millions of years to crack with current technology.
Humans are naturally bad at creating random passwords — we tend to use predictable patterns, favorite numbers, or variations of existing passwords. Studies show that over 80% of data breaches involve weak or reused passwords. A password generator creates truly random passwords using cryptographically secure random number generators (like the Web Crypto API used in this tool), eliminating human bias. Using unique, generated passwords for each account ensures that a breach of one service doesn't compromise your other accounts.
Use a unique password for every account — never reuse passwords across sites. Enable two-factor authentication (2FA) wherever available, even with strong passwords. Consider using a password manager (like Bitwarden, 1Password, or KeePass) to securely store your generated passwords. For passwords you must memorize, use a passphrase method: combine 4-5 random words with numbers and symbols (e.g., 'correct-Horse-battery-9-staple!'). Change passwords immediately if a service reports a data breach.
How to Generate a Secure Password
1. Set Your Options
Choose password length and character types: uppercase, lowercase, numbers, and symbols.
2. Generate
Click Generate to create a cryptographically secure random password using Web Crypto API.
3. Copy & Use
Copy your password to clipboard with one click. Use bulk generation for multiple passwords at once.
Frequently Asked Questions
Is this password generator free?
Yes, 100% free. No registration, no limits. Generate as many passwords as you need.
Are the generated passwords secure?
Yes. We use the Web Crypto API (crypto.getRandomValues) for cryptographically secure random generation. No passwords are stored or transmitted.
Is my data safe?
Absolutely. Everything runs in your browser. No data is sent to any server. Your passwords never leave your device.
What makes a strong password?
A strong password is at least 12 characters long and includes uppercase, lowercase, numbers, and symbols. Avoid personal info or common words.