Password Strength Checker

Test your password security

Understanding password strength is essential for protecting your online accounts. Learn what makes passwords secure, why some fail, and use our interactive tool to test password strength safely.

Ready to Test Your Password?

Our interactive password checker runs entirely in your browser. Your password never leaves your device - it's completely safe to use.

Open Password Checker Tool

What Makes a Password Strong?

Password strength depends on several factors. Understanding these helps you create passwords that are both secure and memorable.

Length

Critical

The most important factor. Each character exponentially increases cracking time. Aim for 12+ characters.

Uniqueness

Critical

Use a different password for every account. Password managers make this easy.

Unpredictability

High

Avoid personal info, dictionary words, and common patterns like "123456" or "password".

aA1!

Character Variety

Medium

Mix uppercase, lowercase, numbers, and symbols - but length matters more than complexity.

Age

Medium

Old passwords may have been in breaches. Check if your passwords have been compromised.

Password Examples: Weak vs Strong

❌Weak Passwords (Never Use These)

password

Most common password, cracked instantly

123456

Second most common, cracked instantly

qwerty

Keyboard pattern, cracked instantly

john1990

Name + year, easily guessed

P@ssw0rd

Common substitution, still weak

iloveyou

Common phrase, in every wordlist

Strong Passwords (Learn From These)

correct-horse-battery-staple

Random words, easy to remember, very strong

MyDog$Barks@3AM!

Memorable phrase with variety, 18 characters

Tr0ub4dor&3

Shorter but complex, still good

purple mountain digital fortress

Four random words with spaces, 33 characters

NIST Password Guidelines (2024)

The National Institute of Standards and Technology (NIST) provides password guidelines used by organizations worldwide. Here are the key recommendations from NIST Special Publication 800-63B:

NIST Recommends

  • Minimum 8 characters (we recommend 12+)
  • Check passwords against known breach lists
  • Allow all printable characters including spaces
  • Allow paste (for password managers)
  • Use multi-factor authentication

❌NIST Discourages

  • Arbitrary composition rules ("must include X")
  • Security questions for password recovery
  • Regular password expiration without reason
  • SMS for two-factor authentication (when other options exist)
  • Truncating long passwords

How Hackers Crack Passwords

Understanding attack methods helps you create better passwords. Here are the most common techniques:

Brute Force Attack

Trying every possible combination until finding the right one. A 6-character password can be cracked in seconds. A 16-character password would take millions of years.

Defense: Use long passwords (12+ characters)

Dictionary Attack

Trying common words and phrases from dictionaries. Also includes variations like "P@ssw0rd" (common substitutions are well-known).

Defense: Avoid dictionary words, or use multiple random words (passphrase)

Credential Stuffing

Using usernames and passwords from data breaches to try on other sites. If you reuse passwords, one breach exposes all your accounts.

Defense: Use unique passwords for every account

Social Engineering

Tricking you into revealing your password through phishing emails, fake websites, or phone calls pretending to be tech support.

Defense: Never share passwords, verify requests through official channels

Frequently Asked Questions

Is it safe to use an online password checker?
Our interactive password checker runs entirely in your browser - your password never leaves your device. We cannot see or store what you type. However, for maximum security, avoid entering your actual passwords anywhere. Instead, test similar passwords of the same length and character types to understand their strength.
What makes a password strong?
Password strength comes primarily from length. A 20-character password is exponentially harder to crack than a 10-character one. Complexity (using mixed case, numbers, symbols) helps but length matters more. The best passwords are passphrases: random words strung together like "correct-horse-battery-staple" which are both strong AND memorable.
How long should my password be?
NIST guidelines recommend at least 8 characters minimum, but we recommend 12+ characters for good security and 16+ for sensitive accounts. Each additional character exponentially increases the time to crack. A 16-character random password would take centuries to crack with current technology.
Why does my password need to be unique?
Data breaches happen constantly. If you reuse passwords and one site is breached, attackers will try those credentials on other popular sites. This is called "credential stuffing" and it is one of the most common ways accounts get hacked. Using unique passwords means a breach on one site does not affect your other accounts.
Should I change my passwords regularly?
Current NIST guidelines (2024) recommend against forced password changes unless there is evidence of compromise. Regular changes often lead to weaker passwords (Password1, Password2, etc.). Instead, focus on using strong, unique passwords and change them only when: you learn of a breach, you shared it with someone, or you suspect it was compromised.
What is NIST password guidance?
NIST (National Institute of Standards and Technology) publishes password guidelines used by governments and organizations worldwide. Key recommendations include: minimum 8 characters, check against known breached passwords, allow all characters including spaces, no composition rules (must have X numbers), no arbitrary expiry, and use multi-factor authentication.

Test Your Password Strength Now

Our password checker analyzes your password locally in your browser. Nothing is sent to our servers.

Test Password StrengthFull Password Guide

Related Resources

Password Security Training

Complete guide to creating and managing strong passwords.

Best Password Managers

Compare password managers to keep your accounts secure.