Password Strength Checker

We measure 8 factors: length (12+ chars), uppercase/lowercase mix, numbers, special characters, absence of common passwords, no repeating characters, and no sequential patterns. We also calculate entropy (bits of randomness) and estimate crack time assuming 10 billion guesses per second.

Local calculations run in your browser. AI features, accounts, saved reports and external data requests use server services. Check the tool description and privacy policy for the relevant processing and storage.

A strong password has 12+ characters, mixes upper/lowercase letters with numbers and symbols, avoids dictionary words and common patterns (abc, 123), and is unique per account. Consider using a passphrase: 4+ random words like 'correct-horse-battery-staple'.

The Password Strength Checker is an online tool that lets you analyze password security with entropy calculation, crack time estimation, and detailed checks. It is part of NexTool's collection of free tools designed to help you work faster and more efficiently.

Using the Password Strength Checker is simple: visit the tool page, enter your data or input into the provided fields, and get instant results. Follow the controls on the page. Some functions require sign-in or a paid plan; see Pricing for limits.

The Free plan includes 10 tool uses per day. Some features require an account or a paid plan. Check the controls on the tool page and Pricing for the applicable limits.

Local calculations run in your browser. AI features, accounts, saved reports and external data requests use server services. Check the tool description and privacy policy for the relevant processing and storage.