무료 온라인 비밀번호 강도 확인기 | Fairmont AI

비밀번호 강도를 무료로 확인하세요. 즉각적인 보안 점수와 개선 제안을 받으세요.

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

How to Check Your Password Strength

  1. Type Your Password: Enter the password you want to check in the input field. Use the eye icon to toggle visibility.
  2. See Instant Results: The strength meter, label, estimated crack time, and criteria checklist update in real time as you type.
  3. Improve Your Password: Check which criteria are not met and add uppercase letters, numbers, special characters, or increase the length to make it stronger.

Frequently Asked Questions

Is my password stored or sent anywhere?

No. This tool runs entirely in your browser using JavaScript. Your password is never transmitted to any server and is not stored anywhere.

What makes a password strong?

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.

What is the estimated crack time based on?

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.

Should I use this to check my actual passwords?

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.

What is a special character?

Special characters are non-alphanumeric symbols such as !, @, #, $, %, ^, &, *, (, ), -, _, =, +, [, ], {, }, ;, :, ', ", ,, ., /, <, >, ?, and space.

Why does length matter so much?

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.

What is a passphrase?

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.

Is a 'Strong' password good enough?

For most purposes, yes. Use a password manager to generate and store unique strong passwords for every account rather than reusing passwords.