Secure String Generator

How to Use

• Set your desired length using the slider
• Choose which character types to include
• Click "Generate" to create a random string
• Click "Copy" to copy it to your clipboard

About This Tool

This generator uses the Web Crypto API to produce cryptographically random strings. Longer strings with more character variety are more secure. We recommend at least 16 characters with all character types enabled for maximum security.

What Is a Password Generator?

A password generator creates random strings of characters that are difficult for attackers to guess or crack. Instead of relying on memorable words, dates, or patterns — which are predictable and vulnerable to dictionary attacks — a generator uses cryptographic randomness to produce truly unpredictable sequences.

The strength of a generated password depends on two factors: length and character variety. A 16-character password using uppercase letters, lowercase letters, digits, and symbols has roughly 105 bits of entropy, making it practically impossible to brute-force with current technology. Even the fastest supercomputers would need billions of years to try every combination.

This tool uses the Web Crypto API (crypto.getRandomValues()), which provides cryptographically secure random numbers. Unlike Math.random(), which is predictable, the Web Crypto API draws from your operating system's entropy pool, ensuring each generated password is truly random.

Frequently Asked Questions

How long should my password be?

Security experts generally recommend at least 12 characters, but 16 or more is better. Each additional character exponentially increases the number of possible combinations, making brute-force attacks impractical. For high-security accounts, consider using 20+ characters.

Should I include symbols in my password?

Yes, when the service allows it. Adding symbols dramatically increases the character pool that an attacker would need to search through. However, some websites restrict which special characters are allowed, so you may need to adjust your settings for those cases.

Is it safe to generate passwords in a browser?

This tool generates passwords entirely on your device using the Web Crypto API. No passwords are sent to any server or stored anywhere. Once you navigate away from the page, the generated password exists only in your clipboard or wherever you saved it.

Why shouldn't I reuse passwords across sites?

If one site suffers a data breach, attackers will try those credentials on other services — a technique called credential stuffing. Using a unique password for every account means a single breach won't compromise your other accounts. Pair this generator with a password manager for the best security.

Common Use Cases

• Account passwords — Generate unique, strong passwords for every online account you create.
• API keys and secrets — Create random strings for application secrets, webhook tokens, or encryption keys.
• Database seed data — Generate realistic random passwords for test users during development.
• Wi-Fi passwords — Create a strong, random passphrase for your home or office network.
• Temporary access codes — Generate one-time passwords for sharing temporary access with colleagues or guests.