Password Strength Checker

Determines the strength of passwords in real time.
Includes automatic generation of secure passwords.

⚡️

Accuracy

Determining 4 attack scenarios

🔒️

Safety

In-browser processing

How to Use This Tool

Enter a password to see strength score and crack time instantly.

🔐 Enter Password

Attack Scenario	Est. Crack Time
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about,

About

An online tool that analyzes and determines the strength of passwords in real time. It evaluates the number of characters, character type (uppercase/lowercase letters, numbers, symbols), complexity of the pattern, etc. from multiple angles, and displays the strength as a score and gauge.

Equipped with automatic generation of secure passwords. Generate strong passwords with one click by specifying the number of characters and types of characters to include.

Everything happens inside your browser and your password is never sent to the server.

how to,

How to Use

STEP 1

Enter your password

Enter the password you want to judge in the input field. Intensity is analyzed in real time as you input.

STEP 2

Check the strength score

The password strength is displayed as a score and a gauge. If there are any weaknesses, suggestions for improvement will also be displayed.

glossary,

Glossary

Password Strength: A measure of the effectiveness of a password against guessing or brute-force attacks. Determined by length, complexity, and unpredictability.
Entropy: A mathematical measure of uncertainty or randomness in a password, calculated in bits. Higher entropy means exponentially harder to crack.
Brute-force Attack: A hacking method that programmatically tries every possible combination of characters until the correct password is found.
Dictionary Attack: An attack that systematically tests words from dictionaries and large lists of previously leaked passwords rather than random character sets.
Character Sets: The basic groups of characters used in passwords: lowercase letters, uppercase letters, numbers, and symbols/special characters.
zxcvbn Algorithm: An industry-standard password strength estimator developed by Dropbox. Used in this tool to intelligently detect keyboard patterns, names, and dictionary words.
Passphrase: A type of password comprised of a sequence of completely unrelated words (e.g., "battery-staple-correct-horse"). They are incredibly strong yet easy to memorize.

faq,

FAQ

Q.Is it completely safe to type my real password here?: Yes. Your password is never sent over the internet or logged anywhere. The complex algorithmic analysis runs entirely within your browser locally.
Q.What score should I aim for?: You should always aim for a score of 3 (Strong) or 4 (Very Strong). Anything scoring 0 to 2 can be cracked by automated tools in a matter of hours or days.
Q.Why is my long password marked as "Weak"?: Our tool uses spatial and dictionary analysis. If your password is long but consists of repeating characters, keyboard walks (like "asdfgh"), or common names, hackers will guess it almost instantly.
Q.How does it calculate the "Crack Time"?: It estimates the time modern offline hashing hardware (testing billions of guesses per second) would mathematically take to find your exact password.
Q.Do I actually need special characters?: Not strictly. While symbols increase entropy quickly, creating a very long passphrase using only letters (over 20 characters) often results in a nearly bulletproof password.
Q.Why not use standard strength meters?: Standard meters just check a fixed checklist (Need 1 capital, 1 symbol). They are dangerously outdated and often pass terrible passwords like "P@ssword1".
Q.Does a strong password make me immune to being hacked?: It protects against brute-force attacks, but not against Phishing (fake login pages) or reusing the same password across multiple sites. Never reuse passwords.