Password Strength Checker
Free online password strength checker, estimate crack time
How Password Strength is Calculated
Password strength is estimated by analyzing the character variety, length, and resistance to common attack methods including brute force, dictionary attacks, and pattern-based attacks. The tool checks for uppercase and lowercase letters, numbers, symbols, and overall length to provide a comprehensive strength score.
Understanding the Crack Time Estimate
The estimated crack time shows how long it would take an attacker to guess your password using brute force at billions of guesses per second. This is a theoretical estimate — real-world attacks may be faster if the password contains dictionary words or common patterns.
▶Why is my password rated weak even though it is long?
A long password using only lowercase letters or common dictionary words is still vulnerable to dictionary and pattern attacks. Adding uppercase, numbers, and symbols significantly improves strength.
▶What is the recommended password length?
For strong security, use at least 12 characters. For critical accounts like banking or email, use 16 or more characters with a mix of all character types.
▶Is the crack time estimate accurate?
The estimate assumes a brute-force attack and provides a best-case scenario. If your password contains dictionary words, names, or common patterns, a targeted attack could crack it much faster.