Password Strength Meter — Test Password Security & Crack Time

A password strength meter evaluates how difficult a password would be to guess or crack. It typically measures length, character variety, and whether the password matches known weak patterns. Good meters translate that into a score, entropy estimate, and approximate crack time so you can compare options before committing to one.

Unlike a simple rule that demands one uppercase letter and one number, modern meters penalize dictionary words, repeated characters, and keyboard walks that satisfy rules but remain easy to attack.

Everyday users test new passwords during signup for email, shopping, and social accounts. Developers embed similar logic in registration forms. IT and security teams demo why length and uniqueness matter during awareness training. Parents and educators show students the difference between password and Password1! versus a long random string.

Anyone migrating to a password manager can test a generated master password locally before trusting it with all their logins.

Enter the password you want to evaluate in the large input field. The strength label and crack time update immediately. Toggle show/hide to confirm spelling without sending data anywhere.

Aim for Very Strong or Strong with crack time measured in years or longer for important accounts. Use the checklist on the left — green checks mean you meet each requirement. Read any amber warnings about common passwords or patterns.

If you need a better password, click Generate strong password for a random 20-character mix, or use our password generator page to customize length and character sets.

Entropy estimates how many bits of unpredictability your password has, based on length and character classes (lowercase, uppercase, digits, symbols). Higher entropy means exponentially more guesses required in a brute-force model.

Crack time divides estimated guesses by an assumed offline attack rate of ten billion guesses per second — a common illustrative baseline. Results range from instant for trivial passwords to centuries for long random strings. Penalties reduce effective entropy when common passwords, keyboard patterns, sequences, or heavy repetition are detected.

Each additional character multiplies the search space attackers must explore. An eight-character password with mixed classes may fall in hours or days under offline cracking. Sixteen random characters can push estimates toward billions of years in the same model.

Long passphrases made of four or more unrelated words can be both memorable and strong when the words are not a famous quote or song lyric.

Substituting @ for a or adding 1 at the end of password does not fool modern attack tools. They try dictionary words with common mutations automatically. Keyboard rows like qwertyuiop and sequences like 123456789 appear in every top-password list.

Random mixes of character types — or long passphrases generated by a dice or password manager — resist dictionary attacks far better than clever but predictable choices.

Reusing one strong password across dozens of sites means a single breach exposes every account. Strength on paper does not help once that hash leaks from any service you used it on.

Password managers store a unique random secret per site so you only memorize one master password — test that master here before enabling it.

Analysis runs entirely in JavaScript in your browser tab. No network request includes your password. We do not log, store, or transmit what you type. Closing the tab clears it from page memory.

For maximum caution on shared computers, test a similar password with the same structure rather than your exact production secret — or use a private browsing window and clear when finished.

Simple policy rules (minimum eight characters, one symbol) can be gamed with Password1! style strings. Entropy-based meters with pattern detection give a more realistic picture. Breach database lookups add whether your exact password already leaked — complementary to this tool, not replaced by it.

Server-side validation at signup remains mandatory for apps you build — this page is for personal testing and education. Multi-factor authentication adds a layer that protects you even when a password is weak or stolen.

Compared to guessing by feel, a meter gives immediate numeric feedback and specific fixes instead of vague it looks okay.

It does not hash or store passwords, check live breach corpuses, or enforce policy on a server. It does not replace MFA, hardware security keys, or account lockout policies. It cannot know whether you reuse the password elsewhere — the uniqueness row is educational guidance.