Password Strength Checker

Enter Password

Enter a password

Checking against common passwords…

Entropy —

0 bits 40 bits 80 bits 120+ bits

Analysis

0 Score

⚡ Estimated Crack Time

—

Enter a password to see crack time

Length

Uppercase

Lowercase

Digits

Symbols

Unique Chars

Char Pool

Entropy (bits)

Security Checklist

Scoring Breakdown

History

No passwords checked yet

Patterns to Avoid

❌ Sequential:

123456

abcdef

❌ Keyboard:


         qwerty


         asdfgh

❌ Repeats:

aaaaaa

111111

❌ Common words:


         password


         admin

❌ Leet speak:


         p@ssw0rd

❌ Dates:


         jan2024


         01/01/90

✅ Use passphrases: 4+ random words

✅ Mix case, digits, symbols

✅ 16+ characters ideal

Privacy

✅ 100% client-side — password never sent to any server

✅ Analysis runs entirely in your browser

Password Security Guide

What is Entropy?

Password entropy measures how unpredictable a password is in bits. It's calculated as log₂(pool_size^length). 40+ bits = weak, 60+ bits = fair, 80+ bits = strong, 100+ bits = very strong.

Crack Time Explained

Crack time estimates assume a modern GPU can attempt ~10 billion hashes/second for offline attacks. Online attacks are typically throttled to ~1000/second. Salted hashes (bcrypt, Argon2) are much more resistant.

Passphrases

Four random words (e.g., "correct horse battery staple") can have 44+ bits of entropy and are easier to remember than complex 8-character passwords. Length matters more than complexity.

Best Practices

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