Password Strength Checker
Check how strong your password is with rule-based analysis.
Enter a password to check its strength
What is a Password Strength Checker and How Does It Work?
A Password Strength Checker evaluates your password against common security criteria including length, character variety, common patterns, and known weak passwords. It uses rule-based scoring without any AI or external services.
How to Use Our Free Password Strength Checker Online
Type or paste your password into the input field. The tool instantly analyzes it and shows a strength score with specific recommendations for improvement. Your password never leaves your browser.
When You Might Need a Password Strength Checker
Use this before setting a new password for any account to ensure it meets security best practices. Also useful for auditing existing passwords.
How Password Strength Scoring Works
The checker scores your password on multiple axes: length contributes the most to entropy, followed by character diversity (mixing uppercase, lowercase, digits, and symbols). It then penalizes common patterns like keyboard walks (qwerty), repeated characters (aaaa), and dictionary words. The combined score maps to a human-readable strength label from Very Weak to Very Strong.
Checking Passwords Without Sending Them to a Server
Privacy is a valid concern when evaluating a password. Our tool runs the entire analysis in your browser using JavaScript. No network requests are made, no data is logged, and your password is never transmitted. You can verify this by checking your browser's network tab during analysis.
Password Strength Checker: Frequently Asked Questions
Is my password sent to a server?
No, all analysis happens locally in your browser. Your password is never transmitted.
What criteria are checked?
Length, uppercase/lowercase mix, numbers, symbols, common patterns, and dictionary words.
What score should I aim for?
Aim for 'Strong' or 'Very Strong' ratings for important accounts.
Does it check against breached passwords?
It checks against a list of commonly used weak passwords, but not a full breach database.