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Our free Password Strength Checker analyzes your password in real time and gives you an instant security score, estimated crack time, and a checklist of criteria. Unlike online services that process your data on a server, this tool runs entirely in your browser — your password is never transmitted anywhere. Check any password you
No. This tool runs entirely in your browser using JavaScript. Your password is never transmitted to any server and is not stored anywhere.
A strong password is at least 12 characters long and includes a mix of uppercase letters, lowercase letters, numbers, and special characters. Avoid dictionary words and personal information.
The crack time estimate is based on a simplified model of password entropy and typical brute-force attack rates. It's an approximation to give you a relative sense of password strength.
Since the tool is 100% browser-based and never transmits data, it's safe to use with real passwords. However, for maximum caution, you can also test structurally similar passwords.
Special characters are non-alphanumeric symbols such as !, @, #, $, %, ^, &, *, (, ), -, _, =, +, [, ], {, }, ;, :, ', ", ,, ., /, <, >, ?, and space.
Each additional character exponentially increases the number of possible combinations an attacker must try. A 16-character password is dramatically stronger than an 8-character one.
A passphrase is a sequence of random words (e.g., 'correct-horse-battery-staple'). Passphrases can be very strong and easier to remember than complex shorter passwords.
For most purposes, yes. Use a password manager to generate and store unique strong passwords for every account rather than reusing passwords.