Password Generator
Generate cryptographically secure passwords using the Web Crypto API with high-entropy randomness. Full control over length (4–128 characters), uppercase, lowercase, numbers, symbols, and custom exclusions. Real-time strength meter, entropy bits display, and bulk generation. No cookies, no storage, no tracking — pure math running in your browser.
Options
Strength Analysis
Click Generate to create secure passwords
How to Generate a Secure Password
Create strong, unique passwords in seconds — no signup required.
Configure your options
Set your desired password length (4–128 characters), choose character sets (uppercase, lowercase, numbers, symbols), and adjust any exclusions.
Check the strength
The real-time strength meter shows entropy bits, character pool size, and estimated crack time before you even generate.
Generate passwords
Click 'Generate' to create one or more cryptographically secure passwords using the Web Crypto API.
Copy and use
Hover over any password and click 'Copy' to copy it to your clipboard. Use 'Copy All' for bulk operations.
Why Random Passwords Matter
Most data breaches start with weak or reused passwords. In 2024 alone, over 10 billion credentials were leaked. Humans are terrible at creating truly random passwords — we tend to use predictable patterns, dictionary words, and personal information that attackers exploit with dictionary and brute-force attacks.
Cryptographically secure password generators solve this by using hardware-backed randomness (the Web Crypto API) to produce passwords with maximum entropy. A 20-character password using all character sets has roughly 130 bits of entropy — making it effectively impossible to brute-force even with the most powerful computing clusters available today.
For best security practice, use a unique generated password for every account combined with a password manager. Never reuse passwords across sites. Enable two-factor authentication (2FA) wherever possible for an additional layer of protection.
Frequently Asked Questions
How does this password generator work?
It uses the Web Crypto API (crypto.getRandomValues) built into your browser to generate cryptographically secure random numbers. These are mapped to your selected character set to produce truly unpredictable passwords — no pseudo-random fallbacks.
Is this password generator safe to use?
Yes. All generation happens entirely in your browser using the Web Crypto API. No passwords are stored, logged, transmitted, or saved anywhere — not in cookies, localStorage, or on any server. The source code is fully transparent.
What makes a strong password?
A strong password has high entropy — meaning it's long and drawn from a large character pool. Use at least 16 characters with uppercase, lowercase, numbers, and symbols. This generator shows you the exact entropy bits and estimated crack time so you can make an informed choice.
What does 'entropy bits' mean?
Entropy measures the randomness of a password in bits. It's calculated as log₂(pool_size) × length. A password with 80+ bits of entropy is considered strong against modern brute-force attacks. 128+ bits is effectively uncrackable.
Why should I exclude ambiguous characters?
Characters like I, l, 1, O, and 0 look similar in many fonts. Excluding them prevents confusion when manually typing or reading passwords aloud, which is useful for shared credentials or printed passwords.
Can I generate multiple passwords at once?
Yes. Use the Quantity slider to generate up to 50 passwords at once. Each password is independently generated with full cryptographic randomness. You can copy individual passwords or all of them at once.