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Password Strength Checker

Check password strength and security level

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About This Tool

Password Strength Checker evaluates your password's security by calculating its entropy in bits and estimating how long it would take to crack. It also generates cryptographically secure passwords and provides visual composition analysis of character types.

Key Features

Quick Preview

Use Cases

password

Frequently Asked Questions

How does the entropy calculation work?

Entropy is calculated by multiplying the password length by the base-2 logarithm of the character pool size. A larger character pool and longer password result in higher entropy, meaning the password is harder to crack through brute force.

How is the crack time estimated?

The crack time is estimated assuming 10 billion guesses per second, which represents modern GPU-based attack speeds. The actual time could vary based on the attacker's resources and the specific hash algorithm used by the target system.

How are the generated passwords created?

Passwords are generated using the Web Crypto API's crypto.getRandomValues method, which provides cryptographically secure random numbers. Each generated password is 20 characters long and includes at least one character from each type: lowercase, uppercase, digits, and symbols.

Is my password sent to any server?

No, all processing happens entirely in your browser. Your password is never transmitted over the network or stored anywhere. The tool works completely offline after the page loads, ensuring your passwords remain private.

What makes a strong password?

A strong password has high entropy, which comes from using a combination of lowercase, uppercase, digits, and symbols along with sufficient length. Passwords with 80 or more bits of entropy are considered very strong and would take centuries to crack at current computing speeds.