Password Strength Checker
// Check password strength with entropy calculation
#About Password Strength Checker
Free online password strength checker. Analyze password entropy, character composition, and estimated crack time. Check against common password patterns. This tool runs entirely in your browser — your data is never sent to a server. Just paste your input, get instant results, and copy with one click. No sign-up or installation required.
#FAQ
What is password entropy? ▾
Password entropy measures the unpredictability of a password in bits. It is calculated as the length of the password multiplied by log2 of the character set size. A password with 80+ bits of entropy is considered very strong. Higher entropy means more possible combinations an attacker would need to try.
Is my password sent to a server? ▾
No. All analysis happens entirely in your browser using JavaScript. Your password never leaves your device and is not transmitted over the network.
</> Embed this tool ▾
Copy this code to embed the tool on your website. Adjust the height to fit your layout.
<iframe src="https://www.browserutils.dev/embed/password-strength-checker" width="100%" height="500" frameborder="0" title="Password Strength Checker"></iframe>