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Password Strength Checker

Check password strength and get improvement suggestions. Free, fast, and works entirely in your browser with no sign-up required.

Password Strength Analyzer

Enter Password

Breach check tip: For full breach database checking, visit HaveIBeenPwned . They use k-anonymity — only the first 5 chars of the SHA-1 hash are sent, never your full password.All analysis on this page is 100% local — nothing is transmitted.

Entropy Explained

Password entropy measures unpredictability in bits. Each additional bit doubles the search space. 60+ bits is good; 80+ is excellent for most accounts; 100+ for secrets that must last decades.

Crack Time Scenarios

Online attacks are throttled by servers (~100–10K/sec). Offline attacks on leaked MD5/NTLM hashes can exceed 100 billion guesses per second with a modern GPU cluster.

Use a Password Manager

The best password is a long, random, unique one for every site. Password managers (Bitwarden, 1Password, KeePass) generate and store them so you only remember one master password.

Passphrases Work Well

4–5 random words (coral-lamp-river-toast) are memorable, long, and have high entropy — often stronger than a complex 10-character password.

Common Patterns to Avoid

Keyboard walks (qwerty, 1234), dictionary words, name + birth year, and l33t substitutions (p@ssw0rd) are all in standard attacker wordlists.

Check Breaches (HIBP)

HaveIBeenPwned lets you check if your password appeared in known data breaches. Only a partial SHA-1 hash is sent — your full password never leaves your browser.