Free Password Strength Checker — Security Score & Analysis

Enter your password (never sent to server):

🔒 Password is never transmitted. Analysis happens locally in your browser.

About This Tool

The password strength checker analyzes your password against multiple security criteria: length, character variety, common patterns, and estimated crack time. It calculates entropy in bits and provides a strength score from Very Weak to Very Strong. Analysis happens entirely in your browser — your password is never transmitted.

Common Use Cases

Auditing existing passwords before a breach
Verifying new passwords meet security requirements
Security training demonstrations
Comparing two password versions
Building password policy guides

Frequently Asked Questions

Is it safe to enter my real password here?

Yes. Analysis happens entirely in your browser using JavaScript. Your password is never transmitted to any server.

What is password entropy?

Password entropy measures randomness in bits. Higher entropy means more possible combinations. 60+ bits is generally considered strong.

What makes a password strong?

Strong passwords are long (16+ characters), use a mix of uppercase, lowercase, numbers, and symbols, and avoid dictionary words.