Is my password safe to enter here?

Yes. The Password Strength Checker runs entirely in your browser using JavaScript. Your password is never transmitted to any server, stored in a database, or logged anywhere. You can even disconnect from the internet and the tool still works.

What is password entropy and why does it matter?

Entropy measures the unpredictability of your password in bits. It is calculated as log2(C^L) where C is the size of the character set you use and L is the password length. Higher entropy means more possible combinations, making brute-force attacks take exponentially longer.

What do the time-to-crack estimates mean?

The estimates show three scenarios: Online Throttled (1,000 guesses per second, like a rate-limited login form), Offline Slow (1 billion/s, like a leaked hash cracked with standard hardware), and GPU Accelerated (100 billion/s, like a high-end GPU rig cracking weak hashes). These are approximations based on entropy, not a guarantee.

What makes a password strong according to this tool?

A strong password combines length (12+ characters), character variety (uppercase, lowercase, numbers, symbols), and avoids detectable patterns like keyboard walks (qwerty), repeated characters (aaa), dictionary words, or sequential strings (123, abc).

How is the strength score calculated?

The score is derived from entropy (bits), penalized for detected patterns such as common words, keyboard sequences, repeated characters, and sequential strings. Each detected pattern reduces the effective entropy. The final score maps to five levels: Very Weak, Weak, Fair, Strong, and Very Strong.

100% Client-Side — Your Password Never Leaves Your Browser

Is Your Password
Strong Enough?

Instantly analyze password strength with entropy scoring, character set analysis, time-to-crack estimates, and actionable improvement tips — all processed locally.

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Entropy Analysis

Calculates bits of entropy based on character set size and password length for a precise strength score.

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Time-to-Crack Estimate

Shows how long it would take to brute-force your password under online, offline, and GPU-accelerated scenarios.

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Pattern Detection

Detects common weaknesses: keyboard walks, repeated characters, common words, and sequential patterns.

Enter Password

Your password never leaves your browser. All analysis happens locally.

Type a password above to see its strength analysis.

Frequently Asked Questions

Everything you need to know about Password Strength Checker.

Is Your PasswordStrong Enough?

Entropy Analysis

Time-to-Crack Estimate

Pattern Detection

Frequently Asked Questions

Is Your Password
Strong Enough?