Best Password Generator Online — Free, Secure, No Signup
Generate cryptographically strong passwords online. Configurable length, character classes, and no data sent to any server — free with no account required.
What Makes a Password Generator Truly Secure
The quality of a password generator comes down to its randomness source and its privacy model. A secure generator uses crypto.getRandomValues() — the browser's cryptographically secure random number generator — not Math.random(), which is predictable. And it runs locally, so generated passwords are never transmitted over the network.
- Cryptographically secure: Uses
crypto.getRandomValues(), notMath.random()— output is unpredictable - Configurable length: Generate passwords from 8 to 128 characters to match any policy requirement
- All character classes: Uppercase, lowercase, digits, and symbols — include or exclude each independently
- Browser-only: No server round-trip — generated passwords stay on your device
- One-click copy: Copy to clipboard instantly for fast credential setup
- No account needed: Generate unlimited passwords immediately, no signup
Choose the Right Variant
- This page: Best password generator — secure, configurable, browser-based
- Password Generator: Generate random passwords online
- Passphrase Generator: Memorable word-based passphrases for master passwords
Password Length and Strength Guide
- 12 characters: Minimum for most accounts — acceptable with all character classes
- 16 characters: Recommended for email, banking, and important accounts
- 20+ characters: Best for administrator accounts, API keys, and high-value targets
- Symbols matter: Adding symbols increases the character set from 62 to 94 — ~6 bits of entropy per character
- Length beats complexity: A 20-character lowercase-only password beats a 12-character mixed-case password in brute-force resistance
- Store in a password manager: Generated passwords are too complex to memorize — use a manager like Bitwarden, 1Password, or KeePass
Privacy and Data Handling
Password generation runs entirely in your browser using the Web Crypto API. Generated passwords are never transmitted to any server and are not logged. Close the tab and the password is gone — copy it to a password manager before closing.
Frequently Asked Questions
What's the difference between crypto.getRandomValues() and Math.random()?
Math.random() is a pseudo-random number generator seeded from a predictable source — its output can potentially be predicted if the seed is known. crypto.getRandomValues() draws from the operating system's entropy pool (hardware events, interrupt timing) and is designed to be cryptographically unpredictable. For passwords, only crypto.getRandomValues() is acceptable. Any password generator that doesn't document its randomness source should be treated with skepticism.
Should I use a browser-based or desktop app password generator?
Both can be equally secure if they use a CSPRNG (cryptographically secure pseudo-random number generator). Browser-based generators that run client-side are convenient and don't require installation. A good password manager (Bitwarden, 1Password, KeePass) includes a built-in generator that stores the password in the same step — reducing the risk of losing it between generation and storage. If your password manager has a built-in generator, use it. If not, a client-side browser tool is a solid alternative.
How often should I change my passwords?
Modern guidance (NIST SP 800-63B) no longer recommends periodic forced password changes — they were found to cause users to make predictable incremental changes (Password1! → Password2!). Instead: (1) use a unique strong password per site, (2) enable two-factor authentication, (3) change passwords immediately when a site reports a breach. Check services like Have I Been Pwned to see if your email appears in known data breaches.