Password Entropy – Free Online Utility

Realistic Password Security Analysis

Many password checkers simply look for numbers or symbols. Our Entropy Checker uses the advanced zxcvbn algorithm, which recognizes patterns, dictionary words, common names, and sequences. This provides a much more accurate representation of how hard it would be for a hacker to crack your password.

What is "Entropy"?

Entropy measures the randomness of your password in bits. A password with 30 bits of entropy has 2^30 (about 1 billion) possible combinations. Security experts recommend a minimum of 60 bits for modern online accounts, and over 100 bits for critical systems.

Privacy is Paramount

We understand that passwords are extremely sensitive. Like all tools on metatool.in, the analysis happens entirely in your browser. Your password never travels to our server, ensuring that your test remains private and secure.

Frequently Asked Questions

Password entropy is a measure of how unpredictable a password is. It is typically measured in bits. Higher entropy means a password is harder for a computer to guess through brute force.

zxcvbn is a password strength estimator inspired by toolkits like Dropbox. It uses a variety of checks including dictionary matching, pattern recognition (like "12345" or "qwerty"), and date detection to give a realistic strength score.

Yes. Our tool runs 100% in your browser. Your password is never sent to a server. However, we recommend testing "similar" passwords rather than your actual production passwords on any website.

Related Free Tools

Password Generator — Generate strong, secure passwords directly in your browser.
Secure Passphrase — Generate memorable but high-entropy passphrases (Diceware).