🔐 Password Entropy Checker

Check your password's strength with detailed entropy analysis. Estimates crack time and identifies weaknesses. All computation happens locally in your browser.

Enter Password

Length

Charset Size

Entropy (bits)

Strength

Crack Time

Char Types

How to Use the Password Entropy Checker

Using the Password Entropy Checker is straightforward:

Enter Your Values
Input the required numbers and parameters into the calculator fields. Each field is clearly labeled — simply type your values or use the spinner controls to adjust them.
Configure Options
Select any additional options such as computation mode, currency, time period, or precision level. The calculator updates automatically as you change values.
View the Results
The calculated result is displayed instantly with clear formatting. You can Copy the result to your clipboard or adjust input values to see how different scenarios affect the outcome.

FAQ

What is password entropy?

Password entropy measures unpredictability in bits. Higher entropy means a more secure password. Generally, 80+ bits is considered secure.

How is password entropy calculated?

Formula: E = log₂(S^L) where S is character set size and L is length. Actual entropy also accounts for dictionary words and common patterns.

What makes a strong password?

A strong password: 12+ characters, mix of uppercase, lowercase, digits, and special chars, no common words or personal info, unique per site.

How long to crack a strong password?

A 12-char password with mixed case+digits+symbols (~80 bit entropy) would take billions of years with modern GPU brute force.