Password Strength Tester

Free Password Strength Tester — Check & Generate Secure Passwords

Our free password strength tester analyses any password instantly and tells you exactly how long it would take a hacker to crack it using a modern GPU cluster running 10 billion guesses per second. You also get instant tips on how to make your password stronger — all running locally in your browser, with no data ever transmitted or stored.

Alongside the tester, the built-in strong password generator creates cryptographically random passwords of any length using your browser’s secure random engine — so every generated password is truly unpredictable and unique.

What this password strength tester checks

• Estimated crack time based on brute-force attack at 10 billion guesses per second
• Password length — minimum 12 characters recommended, 16+ for strong protection
• Uppercase and lowercase letter usage
• Numbers and special characters in your password
• Whether your password appears in a list of the most common passwords
• Bits of entropy, character pool size, and total number of possible combinations

How to create a strong password

A strong password is at least 16 characters long and combines uppercase letters, lowercase letters, numbers, and symbols. Avoid dictionary words, names, dates, or any password from a common list. The best approach is to use our free password generator above — it creates a cryptographically random password that is practically impossible to crack.

All analysis and generation happens entirely in your browser. Your password never leaves your device and is never stored or transmitted anywhere.