***Password Generator
Generate secure random passwords
Secure Password Generator Complete Guide
A strong password is the first line of defense for protecting your accounts and personal data. This tool uses the browser's Web Crypto API (crypto.getRandomValues) to instantly generate cryptographically unpredictable passwords. Nothing is ever sent to a server, and you can generate up to 20 passwords at once.
NIST Password Guidelines (2020)
The U.S. National Institute of Standards and Technology (NIST) significantly revised its password policy in 2020. Key changes include:
Length Over Complexity
NIST recommends a minimum of 8 characters, but 16+ characters is far safer in practice. Each additional character multiplies the number of combinations by the charset size. Going from 12 to 16 characters with a 95-character charset increases combinations by about 81 million times.
Avoid Mandatory Rotation
NIST concluded that forcing periodic password changes actually weakens security. Change passwords only when a breach is suspected; otherwise, maintain a strong, unique password over time.
Unique Password Per Site
Reusing passwords across sites means one breach exposes all your accounts (credential stuffing). Generate a unique password for each site with this tool and store them in a password manager.
Character Sets and Entropy
Password strength is measured in entropy (bits). Formula: length × log₂(charset size)
Entropy Comparison by Charset
| Charset | Size | 16-char Entropy | Security Level |
|---|---|---|---|
| Lowercase only (a-z) | 26 | 75 bits | Fair |
| Upper + lowercase | 52 | 91 bits | Good |
| Upper + lower + digits | 62 | 95 bits | Strong |
| Upper + lower + digits + symbols | 95 | 105 bits | Very Strong |
Using a Password Manager
Password managers like Bitwarden (free, open source), 1Password, and KeePassXC let you use unique, complex passwords per site without memorizing them — just one master password. Generate passwords here and register them in your manager.
Common Patterns to Avoid
- Dictionary attacks — Word-based passwords (password1!, Spring2024!) are vulnerable. Use fully random generation.
- Keyboard patterns — qwerty, 123456, asdfgh are in every hacker wordlist.
- Personal info — Birthdates, names, phone numbers are vulnerable to social engineering.
- Password reuse — One breach exposes everything. Always use different passwords per site.
Frequently Asked Questions
- Are generated passwords stored on a server? — No. All generation happens entirely in your browser.
- Are special characters required? — They increase entropy, but increasing length is often more effective.
- What length is recommended? — 16 characters for general accounts, 20+ for financial or email accounts.
- Should I also use 2FA? — Yes. Combining a strong password with two-factor authentication (TOTP, hardware key) is the most secure approach.
Tip: This tool uses the Web Crypto API, generating mathematically unpredictable, cryptographically secure random passwords.