Password Strength
Checker

Strength is calculated using estimated crack time based on entropy (bits of randomness), penalised for common patterns, dictionary words, keyboard sequences, and repeated characters.

Length is the most important factor — each additional character multiplies the search space. A mix of uppercase, lowercase, digits, and symbols significantly increases complexity. Avoid dictionary words and predictable patterns.

A password that would take decades to crack with current hardware is considered strong. Anything that can be cracked in under a day is very weak.

No. The strength check runs entirely in your browser. Your password is never transmitted anywhere.

Yes. Since no data leaves your browser it is safe to test real passwords. But for maximum security, use a dedicated password manager to generate and store credentials.