Developer Tools
Password Strength Checker
Check how strong a password is. Entropy bits, character diversity, common-password check.
Your password is checked locally. Nothing is uploaded.
Files processed in your browser
Your files never leave your device. No upload, no servers.
About Password Strength Checker
Password Strength Checker estimates entropy in bits, evaluates character diversity, and flags common-password matches. Get instant feedback on what's missing — length, mixed case, digits, symbols, and patterns to avoid.
Privacy-first: your password is checked locally. We never send it to any server, never log it, never compare it against a remote breach database.