Password Checker
Analyze the strength and security of any password instantly.
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About This Tool
Check how strong your password is by analyzing length, character variety, common patterns, and entropy. Ideal for developers, security-conscious users, and anyone creating accounts. Runs entirely in your browser — your password never leaves your device.
How to Use
- Type or paste your password into the input field.
- Review the strength meter, entropy score, and estimated crack time.
- Follow the suggestions to improve weak passwords before using them.
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Frequently Asked Questions
- How is password strength calculated?
- Strength is determined by evaluating length, character set diversity (lowercase, uppercase, digits, symbols), entropy in bits, and the presence of common patterns like sequential characters or dictionary words. A combination of these factors produces the final score.
- Does this tool store or transmit my password?
- No. All analysis happens locally in your browser using JavaScript. Your password is never sent to any server, stored in any database, or logged anywhere. You can verify this by checking the network tab in your browser's developer tools.
- Is this tool free to use?
- Yes. This tool runs entirely in your browser with no account required. Your data never leaves your device.
- What makes a password strong?
- A strong password is at least 12 characters long and includes a mix of uppercase letters, lowercase letters, numbers, and special symbols. Avoid dictionary words, personal information, and common patterns like '123' or 'qwerty'.
- Does this work on mobile?
- Yes. The tool is fully responsive and works on any device with a modern browser.