Password Checker
Test your password strength instantly. Our free password tester analyzes security, complexity, entropy, and estimated crack time — right in your browser.
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Generate a cryptographically secure password in one click with our free password generator.
Free Online Password Checker — How It Works
Our password checker (also known as a password strength tester or password security checker) analyzes your password to determine how resistant it is to common cracking techniques. Unlike other password checkers that send your data to a server, our pw checker runs entirely in your browser — ensuring your password stays private.
The password strength test evaluates multiple factors including character length, character type diversity, randomness patterns, and calculates the mathematical entropy. Based on these factors, it provides an overall strength rating from Weak to Very Strong and estimates how long it would take a modern attacker to crack your password.
What Does Our Password Tester Check?
Password Length
Longer passwords are exponentially harder to crack. We recommend a minimum of 12 characters.
Character Complexity
Using uppercase, lowercase, numbers, and symbols maximizes the search space.
Entropy (Bits)
A mathematical measure of randomness. Higher entropy = stronger password.
Crack Time Estimate
Based on 1 trillion guesses per second (modern GPU cluster capability).
Password Checker FAQ
How does the password checker work?
Our password checker analyzes your password entirely in your browser. It evaluates length, character variety (uppercase, lowercase, numbers, symbols), entropy bits, and estimates crack time based on modern hardware capabilities. Your password is never sent to any server.
Is this password checker safe to use?
Yes, absolutely. Our password checker runs 100% client-side in your browser using JavaScript. Your password never leaves your device — it is not transmitted over the internet or stored anywhere. You can even disconnect from the internet and the tool will still work.
What makes a password strong?
A strong password is at least 12-16 characters long and includes a mix of uppercase letters, lowercase letters, numbers, and symbols. It should be randomly generated and unique for each account. Use our password generator to create one instantly.
How is password strength measured?
Password strength is measured using entropy (in bits). Under 28 bits is weak, 28-36 is fair, 36-60 is strong, and 60+ bits is very strong. Our password tester calculates this automatically based on your password's length and character diversity.
Can this tool check if my password has been breached?
Our password checker evaluates password strength based on its characteristics. For breach checking, we recommend using services like Have I Been Pwned. A strong score from our checker means your password is resistant to brute-force cracking attacks.
What is the difference between a password checker and a password strength tester?
They are the same thing. A password checker (also called password tester, pw checker, password strength checker, or password security checker) analyzes your password to determine how resistant it is to cracking.