Password Strength Checker
Instantly analyze the strength of any password without sending it to any server. Our free Password Strength Checker evaluates length, character variety, pattern usage, and entropy to give you a detailed strength score and actionable recommendations. Find out if your password is Weak, Fair, Strong, or Very Strong, and learn exactly what makes a password secure.
Password Strength Checker
Your password never leaves your browser — 100% private.
How to Use Password Strength Checker
- 1Type your password into the input field
- 2View the strength indicator (Weak / Fair / Strong / Very Strong)
- 3Read the detailed breakdown of what factors affect your score
- 4Use recommendations to improve your password
Your Privacy is Protected
Password Strength Checker runs entirely in your browser. Your files and data are never uploaded to any server, never stored, and never shared. Everything happens locally on your device using secure browser APIs.
Frequently Asked Questions
Is my password sent anywhere?
Absolutely not. The password never leaves your browser. All analysis runs entirely client-side in JavaScript.
What makes a password strong?
Length (16+ characters), a mix of uppercase, lowercase, numbers and symbols, and avoiding dictionary words or personal information.
What is password entropy?
Entropy measures how unpredictable a password is. Higher entropy means more combinations an attacker must try, making the password harder to crack.