Secure Password Generator
Generate cryptographically secure random passwords with customizable length, character types and ambiguous character exclusion
Secure String Generator
Pro tip: Use 16+ characters with all types for maximum security.
How to Use Secure String
- 1 Set your desired password length (8-128 characters)
- 2 Select character types: uppercase, lowercase, numbers, symbols
- 3 Enable "Exclude Ambiguous" to remove confusing characters (I, l, 1, O, 0)
- 4 Click "Generate" or press Enter for a new password
- 5 Click "Copy" to copy to clipboard
What You Get
A completely random string using the Web Crypto API (window.crypto.getRandomValues). This is the gold standard for password generation.
Input: 16 chars, all types
Output: xK9#mP2$vL5nQ8@r
Input: 24 chars, no symbols
Output: Hj7kLm9NpQrSt2VwXy4Z6B8c
How do I generate a secure random password?
Set length (16+ recommended), select character types (uppercase, lowercase, numbers, symbols), click Generate. We use cryptographic randomness for maximum security.
What is the best password length?
12 characters minimum, 16+ recommended. For high-security accounts, use 20+ characters. Each additional character exponentially increases security.
Is Math.random used for password generation?
Never. We exclusively use window.crypto.getRandomValues() which is cryptographically secure. Math.random is predictable and insecure.
What is password entropy?
Entropy measures randomness in bits. Higher entropy means harder to crack. A 16-character password with all types has about 100 bits of entropy.
What are ambiguous characters and should I exclude them?
Characters that look similar: I/l/1 and O/0. Excluding them prevents typing errors when entering passwords manually.
Is my generated password stored anywhere?
No. Passwords are generated 100% locally in your browser. Nothing is ever sent to any server.
Should I use all character types?
Yes for maximum security. Each character type increases the pool of possibilities: lowercase (26), uppercase (26), numbers (10), symbols (32+).
How secure is a 12-character password?
A 12-character password with all types has about 72 bits of entropy. Good for most accounts. Use 16+ for critical accounts.
Related:
Passwords are generated locally in your browser. Nothing is sent to our servers.