What is a Password Strength Checker?
A password strength checker analyzes a password's length and character composition to estimate how resistant it would be to guessing and brute-force attacks, then gives concrete feedback on what to improve.
How to Use This Password Strength Checker
- Type your password into the field — click Show to verify what you typed.
- Watch the strength badge and feedback list update instantly.
- Address any "✗" items in the feedback list to improve your score.
- Check the estimated crack time for a rough sense of resistance to brute force.
When Do You Need This Tool?
Use this checker when creating a new account password, setting a master password for a password manager, or auditing existing passwords for weaknesses before a security review.
Frequently Asked Questions
What makes a strong password?
A strong password is long (16+ characters), uses a mix of uppercase, lowercase, numbers, and symbols, avoids dictionary words or personal information, and is unique to each account.
How are passwords cracked?
Attackers typically use dictionary attacks against common passwords, brute-force attacks that try every combination, or credential-stuffing attacks that reuse passwords leaked from other breaches. Length and uniqueness defend against all three.
Should I use passphrases?
Passphrases — several random unrelated words strung together — can be both long and memorable, making them a strong alternative to short complex passwords, especially for master passwords you must type by hand.
How to remember strong passwords?
Use a password manager to store unique random passwords for every account, so you only need to remember one strong master password instead of dozens of individual ones.