Password Tools
SecurityGenerate strong passwords and test password strength instantly. Customize length, character sets, and entropy. Evaluate real-world crack time estimates client-side.
Create secure random passwords with custom options
Length20
StrongCharset:
No passwords yet
Configure your options above and click Generate.
About Password Tools
Strong passwords are your first line of defense against unauthorized access. This tool both generates cryptographically random passwords and analyses the strength of existing ones—measuring entropy, estimating crack time, and detecting common patterns. Everything runs locally in your browser.
Features
- ✓Cryptographically random password generation using Web Crypto
- ✓Configurable length from 4 to 256 characters
- ✓Toggle uppercase, lowercase, digits, and symbols
- ✓Exclude ambiguous characters (0, O, l, 1)
- ✓Real-time entropy calculation in bits
- ✓Crack-time estimates for offline brute-force attacks
- ✓Strength meter with color-coded feedback
- ✓Bulk generation of multiple passwords
Common Use Cases
- Creating master passwords for password managers
- Generating service account or API secret values
- Verifying your existing passwords meet security policies
- Teaching password concepts in security training sessions
- Producing random secrets for environment configuration files
Frequently Asked Questions
QHow much entropy is enough for a strong password?
Security professionals recommend at least 80 bits of entropy for most accounts (roughly 12+ random characters from a large set). For high-value accounts, aim for 128 bits or more.
QIs the password stored or transmitted?
No. All generation and analysis happens in your browser using the Web Crypto API. Nothing is sent to a server.
QShould I use a passphrase instead?
Passphrases (4–5 random words) can achieve equivalent entropy while being more memorable. Both approaches are valid; the key factor is randomness and length.