Password Strength Checker
Instantly analyze your password security, calculate entropy, and get estimated crack times completely client-side.
Strength
Very Weak
Lowercase letters (a-z)
Uppercase letters (A-Z)
Numbers (0-9)
Symbols (!@#$%)
Entropy
0 bits
Estimated Crack Time
Instantly
Suggestions to improve:
Frequently Asked Questions
1. What makes a password strong?
A strong password is long (usually 12-16 characters or more) and unpredictable. It should contain a mix of uppercase and lowercase letters, numbers, and symbols. Most importantly, it should not be based on dictionary words, common phrases, or personal information.
2. What is password entropy?
Password entropy is a scientific measurement of how unpredictable a password is, typically calculated in bits. It considers both the length of the password and the size of the character pool used (letters, numbers, symbols). A higher entropy score indicates a more secure password against brute-force attacks.
3. How is crack time calculated?
Crack time is a theoretical estimate based on the password's entropy and the assumed hashing speed of an attacker's hardware. We assume an attacker can perform billions of guesses per second. Note that actual crack times vary widely depending on the encryption algorithm and attacker resources.
4. Is my password stored or sent to a server?
Absolutely not. This password strength checker works 100% client-side in your web browser. No data is ever transmitted over the network or stored on our servers. You can even use this tool offline.
5. What is the recommended password length?
Security experts generally recommend a minimum of 12 characters for standard accounts, but 16+ characters is preferred for important accounts like email or banking. Using a password manager allows you to easily generate and store long, complex passwords for every site.