What is a Cryptographically Secure Password Generator?
A password generator creates random strings of characters for use as passwords. The critical distinction between a secure password generator and an insecure one is the source of randomness. Our tool exclusively uses the crypto.getRandomValues() API — the same cryptographic random number generator used in security software and password managers. This is fundamentally different from Math.random(), which is predictable and should never be used for security-sensitive applications.
A strong password needs three things: sufficient length (16+ characters), complexity (uppercase, lowercase, numbers, and symbols), and unpredictability (true randomness). Our generator gives you full control over all three factors, letting you create passwords tailored to any site's requirements.
All generation happens entirely in your browser. Your passwords are never transmitted over the internet or stored anywhere. Once you close the tab, they are gone.
How to Use the Password Generator
- Set your desired password length using the slider (8–128 characters).
- Choose which character types to include: uppercase, lowercase, numbers, and/or symbols.
- Optionally enable "Exclude ambiguous characters" to remove easily confused chars like
0,O,1,l,I. - Set the quantity (1–10 passwords) to generate multiple at once.
- Click Generate and copy your desired password.
Features
- ✅ Uses
crypto.getRandomValues()— cryptographically secure - ✅ Configurable length: 8 to 128 characters
- ✅ 4 character sets: uppercase, lowercase, numbers, symbols
- ✅ Exclude ambiguous characters option
- ✅ Generate 1–10 passwords simultaneously
- ✅ Live strength meter (Weak / Fair / Good / Strong)
- ✅ One-click copy per password or copy all
- ✅ 100% offline — passwords never leave your browser
FAQ
How long should my password be?
Security experts recommend a minimum of 12 characters for general accounts and 16+ characters for sensitive accounts like email, banking, or admin dashboards. A 16-character random password from our generator is virtually uncrackable with current technology.
Is it safe to use an online password generator?
Our generator is safe because it uses crypto.getRandomValues() which is a hardware-backed source of entropy, and all processing happens locally in your browser — nothing is sent to our servers. That said, you should always store generated passwords in a trusted password manager like Bitwarden or 1Password.
Why not use Math.random() for passwords?
Math.random() is a pseudo-random number generator (PRNG) that is deterministic and can be predicted if an attacker knows the seed or observes enough outputs. crypto.getRandomValues() uses the operating system's cryptographically secure random source (e.g., /dev/urandom on Linux), making it suitable for security applications.
Should I use symbols in my password?
Including symbols dramatically increases password entropy. A 12-character password using only lowercase letters has about 58 bits of entropy. Adding uppercase, numbers, and symbols for the same length jumps to 79 bits — making brute-force attacks roughly 221 times harder (over 2 million times more difficult).