Password Strength Checker

Check how easily your password can be guessed by real-world attack patterns.

Get entropy, crack-time estimates, and practical warnings directly in your browser with local-only analysis.

Run a Brute Force Vulnerability Test

Enter Password to Analyze

Need one? Open Generator →

Strength: —

Entropy: 0 Bits Estimated Crack Time

Desktop: —

Hacker Rig: —

Privacy Guard: This is an offline password tester. Keystrokes are processed locally with a no-data-upload policy.
Heuristic Engine: Powered by zxcvbn library implementation for realistic pattern and dictionary matching.

Using easy passwords based on names, birthdays, seasons, or simple word-number combinations.
Reusing one password across multiple websites and apps.
Sharing passwords in chats, email, documents, or screenshots.
Writing passwords down in notes, spreadsheets, or unsecured files.
Skipping multi-factor authentication on important accounts.
Relying only on browser auto-save instead of a dedicated password manager.

Your input is analyzed on this page and does not need to be sent to our servers.
The checker is designed to help you spot weak structures before attackers do.
Results focus on practical risk: predictable patterns, dictionary matches, and substitution tricks.
If a password scores weak, improve length and uniqueness first, then add complexity.

Compares your password against common dictionaries and known weak patterns.
Detects substitutions like a→@, s→$, o→0, and i→1 that attackers already expect.
Flags easy sequences such as 12345, abcde, qwerty, or repeated characters.
Estimates entropy and crack time under different attacker hardware assumptions.

Use at least 14 characters; longer passwords are dramatically harder to brute-force.
Prioritize uniqueness for every account to prevent one breach from spreading.
Avoid personal info, obvious words, and keyboard patterns attackers test first.
Length plus unpredictability matters more than only meeting minimum checkbox rules.

A passphrase can be a long, memorable sentence instead of a short complex string.
Every extra character increases guess cost, often by orders of magnitude.
Mix uncommon words and punctuation to improve resistance without hurting recall.
For high-value accounts, combine strong passphrases with multi-factor authentication.

Is it safe to type my real password into this tool?

Yes. This tool runs analysis locally in browser memory with a strict no-data-upload policy.

What does the score actually represent?

The score estimates how many guesses an attacker may need based on patterns, dictionary matches, and structure predictability.

Does this tool check breach databases in real time?

No. This page focuses on local strength analysis and does not upload your password for external breach lookups.

Why does my 12-character password show as weak?

If the structure is predictable, attacker dictionaries can still crack it quickly even when the length looks acceptable.