How do I check my password strength online?

Simply type or paste your password into the checker. It instantly analyzes length, character variety, patterns, and common password lists to give you a strength score (weak, fair, good, strong, very strong) with specific improvement suggestions.

How is password strength calculated?

Strength is based on multiple factors: length (most important), character variety (uppercase, lowercase, numbers, symbols), uniqueness, absence of common patterns (123456, qwerty), no dictionary words, and not appearing in known data breach lists.

What is password entropy and why does it matter?

Entropy measures the randomness of a password in bits, calculated as log2(charset_size^length). Higher entropy = more possible combinations = harder to crack. 40 bits is weak, 60 bits is minimum, 80+ bits is strong, 100+ bits is very strong.

How accurate is the password crack time estimate?

The estimate assumes 10 billion guesses per second (high-end GPU attack). Real crack times vary based on the attacker's resources, the hashing algorithm used (bcrypt is slower to crack than MD5), and whether your password is in wordlists.

Why is my password marked as common or compromised?

We check against lists of frequently used passwords from data breaches (like "password123", "qwerty", "123456"). These passwords are the first ones attackers try in dictionary attacks. Even if it seems unique to you, it may be common globally.

What makes a password weak and easy to crack?

Weak passwords include: short length (<12 chars), only lowercase letters, dictionary words, personal information (names, birthdays), common patterns (123456, qwerty, abc123), keyboard walks (qweasd), and passwords reused across sites.

Is a longer password always more secure?

Generally yes - length is the most important factor. However, character variety matters too. "aaaaaaaaaaaa" is weak despite being long. "Tr0ub4dor&3" (11 chars with variety) is stronger than "aaaaaaaaaaaaaaaa" (16 chars, one type).

Should I use a passphrase instead of a password?

Yes! Passphrases like "correct-horse-battery-staple" are long (high entropy), memorable, and easy to type. Add numbers and symbols between words for extra security. A 4-word passphrase can have 60+ bits of entropy while being memorable.

Why should I avoid sequential characters in passwords?

Sequences like "abc", "123", "qwerty", or "asdf" are predictable and included in password cracking dictionaries. Attackers specifically test for keyboard patterns and sequential characters as they're commonly used.

Is this password strength checker checking my password online?

No! All analysis happens 100% in your browser using JavaScript. Your password is NEVER sent to any server, stored, or logged. You can verify this by disconnecting from the internet - the tool works completely offline.

What is the best password strategy for security?

Use a password manager (1Password, Bitwarden, KeePass) to generate and store unique, strong passwords for every account. Enable two-factor authentication (2FA) wherever possible. Never reuse passwords across sites.

How many characters should a strong password have?

Minimum 12 characters for basic security, 16+ characters for important accounts (email, banking), 20+ characters for maximum security. Each additional character exponentially increases the number of possible combinations.

Why is password reuse dangerous?

If one site is breached, attackers try those credentials on other sites (credential stuffing). Using unique passwords for each account means one breach doesn't compromise all your accounts. Password managers make this easy.

What special characters make passwords stronger?

Any symbols increase strength by expanding the character set: !@#$%^&*()_+-=[]{}|;:'",.<>?/`. Using 2-3 symbols throughout the password (not just at the end) significantly increases entropy and resistance to dictionary attacks.

How do hackers crack passwords?

Common methods: dictionary attacks (trying common passwords), brute force (trying all combinations), credential stuffing (using leaked passwords), rainbow tables (precomputed hashes), and social engineering. Strong, unique passwords defend against most attacks.

How do I check my password strength online?

Simply type or paste your password into the checker. It instantly analyzes length, character variety, patterns, and common password lists to give you a strength score (weak, fair, good, strong, very strong) with specific improvement suggestions.

How is password strength calculated?

Strength is based on multiple factors: length (most important), character variety (uppercase, lowercase, numbers, symbols), uniqueness, absence of common patterns (123456, qwerty), no dictionary words, and not appearing in known data breach lists.

What is password entropy and why does it matter?

Entropy measures the randomness of a password in bits, calculated as log2(charset_size^length). Higher entropy = more possible combinations = harder to crack. 40 bits is weak, 60 bits is minimum, 80+ bits is strong, 100+ bits is very strong.

How accurate is the password crack time estimate?

The estimate assumes 10 billion guesses per second (high-end GPU attack). Real crack times vary based on the attacker's resources, the hashing algorithm used (bcrypt is slower to crack than MD5), and whether your password is in wordlists.

Why is my password marked as common or compromised?

We check against lists of frequently used passwords from data breaches (like "password123", "qwerty", "123456"). These passwords are the first ones attackers try in dictionary attacks. Even if it seems unique to you, it may be common globally.

What makes a password weak and easy to crack?

Weak passwords include: short length (<12 chars), only lowercase letters, dictionary words, personal information (names, birthdays), common patterns (123456, qwerty, abc123), keyboard walks (qweasd), and passwords reused across sites.

Is a longer password always more secure?

Generally yes - length is the most important factor. However, character variety matters too. "aaaaaaaaaaaa" is weak despite being long. "Tr0ub4dor&3" (11 chars with variety) is stronger than "aaaaaaaaaaaaaaaa" (16 chars, one type).

Should I use a passphrase instead of a password?

Yes! Passphrases like "correct-horse-battery-staple" are long (high entropy), memorable, and easy to type. Add numbers and symbols between words for extra security. A 4-word passphrase can have 60+ bits of entropy while being memorable.

Why should I avoid sequential characters in passwords?

Sequences like "abc", "123", "qwerty", or "asdf" are predictable and included in password cracking dictionaries. Attackers specifically test for keyboard patterns and sequential characters as they're commonly used.

Is this password strength checker checking my password online?

No! All analysis happens 100% in your browser using JavaScript. Your password is NEVER sent to any server, stored, or logged. You can verify this by disconnecting from the internet - the tool works completely offline.

What is the best password strategy for security?

Use a password manager (1Password, Bitwarden, KeePass) to generate and store unique, strong passwords for every account. Enable two-factor authentication (2FA) wherever possible. Never reuse passwords across sites.

How many characters should a strong password have?

Minimum 12 characters for basic security, 16+ characters for important accounts (email, banking), 20+ characters for maximum security. Each additional character exponentially increases the number of possible combinations.

Why is password reuse dangerous?

If one site is breached, attackers try those credentials on other sites (credential stuffing). Using unique passwords for each account means one breach doesn't compromise all your accounts. Password managers make this easy.

What special characters make passwords stronger?

Any symbols increase strength by expanding the character set: !@#$%^&*()_+-=[]{}|;:'",.<>?/`. Using 2-3 symbols throughout the password (not just at the end) significantly increases entropy and resistance to dictionary attacks.

How do hackers crack passwords?

Common methods: dictionary attacks (trying common passwords), brute force (trying all combinations), credential stuffing (using leaked passwords), rainbow tables (precomputed hashes), and social engineering. Strong, unique passwords defend against most attacks.

Password Strength Checker

simple

Check password strength with detailed analysis. Get entropy score, crack time estimate, and security improvement suggestions.

Generatorspasswordstrengthcheckersecurity

100% Private - Runs Locally

How to Use

1Enter password to check
2View strength score
3See improvement suggestions
4Check crack time estimate

Examples

Weak Password

Input

password123

Output

Score: 15/100 - Very Weak (common password)

Strong Password

Input

K9#mP2$xL5@nQ8&w

Output

Score: 85/100 - Very Strong (centuries to crack)

Passphrase

Input

correct-horse-battery-staple

Output

Score: 70/100 - Strong (years to crack)

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