100% Client-Side

Password Strength Checker

Free online password strength checker. Analyze entropy, crack time, and get suggestions to improve your passwords. 100% client-side. — runs 100% in your browser, client-side only. No data is sent to any server. Free to use, no account required.

Free Client-Side No Login No Storage
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How to Use the Password Strength Checker

  1. Type or paste a password into the field.
  2. Strength score, entropy (bits), and estimated crack time are shown instantly.
  3. Follow the suggestions to improve weak passwords.

What makes a strong password?

  • Length — 16+ characters is significantly stronger than 8
  • Character variety — mix uppercase, lowercase, numbers, and symbols
  • Unpredictability — avoid dictionary words, names, or keyboard patterns
  • Uniqueness — never reuse passwords across sites

Privacy note: Your password never leaves your browser. All analysis is done client-side with zero network requests.

What is Password Strength Checker?

A password strength checker analyzes passwords for entropy, common patterns, dictionary words, and known breaches. It estimates crack time and provides specific feedback for improvement.

Why Use This Tool

Users often think passwords are stronger than they are. A strength checker reveals vulnerabilities — dictionary words, predictable patterns, insufficient length — before attackers exploit them.

When to Use It

Use password strength checking when creating new passwords, auditing existing passwords, educating users about security, or testing password policy enforcement.

Common Uses

  • Evaluating new password strength
  • Auditing existing passwords
  • Educating users about security

Frequently Asked Questions

What makes a password strong?

Length matters most. 16+ random characters are better than 8 complex characters. Avoid dictionary words, patterns (123, qwerty), and personal information.

Is my password sent anywhere?

No. CipherKit analyzes passwords entirely in your browser. Your password never leaves your device — safe to check sensitive passwords.

Why is my 'complex' password weak?

Common substitutions (p@ssw0rd), keyboard patterns (qwerty), and dictionary words with numbers are well-known to attackers and included in cracking dictionaries.