Password Strength Checker

1. Type your password — Enter any password into the input field. The analysis updates in real time as you type.
2. Check the strength score — View the overall score (0–100), entropy in bits, and estimated crack time. The color-coded bar shows weak (red) to strong (green).
3. Review character analysis — See counts of uppercase, lowercase, numbers, and special characters. Warnings highlight sequential patterns, repeated characters, or common passwords.
4. Read suggestions — If the password is weak, the tool shows specific suggestions to improve it, such as adding length, mixing character types, or avoiding common patterns.
5. Toggle visibility — Click the eye icon to reveal or hide the password. Your password never leaves your device.

A strong password is one that is long, complex, and unpredictable. Length is the single most important factor — each additional character exponentially increases the number of possible combinations.

• Length ≥ 12 characters — Minimum recommended by NIST and OWASP. Each extra character adds significant entropy.
• Mix of character types — Uppercase, lowercase, numbers, and special symbols increase the effective character set size.
• Avoid common patterns — No sequential characters ("123", "abc"), keyboard patterns ("qwerty"), or repeated characters ("aaa").
• Not in common password lists — Avoid passwords that appear in known data breaches (like "password", "admin", "123456").
• Unique per service — Never reuse passwords across different websites or applications.

Entropy measures how difficult it is to guess a password based on the number of possible combinations. It is expressed in bits. A password with n bits of entropy requires at most 2ⁿ attempts to brute-force.