Password Strength Checker
Check your password’s strength, entropy, and get tips to improve it — nothing is transmitted.
How password strength is calculated
This tool scores your password based on its length and the variety of character classes used (lowercase, uppercase, digits, symbols). Entropy is calculated as length × log₂(pool size), where pool size is the number of unique character types available.
A higher entropy means more possible combinations an attacker must try — generally 60+ bits is considered good and 80+ bits is excellent for most use cases.
FAQ
Is my password sent anywhere? No — everything runs in your browser. Your password never leaves your device.
How many bits of entropy do I need? 60 bits is a solid baseline; 80+ is excellent for sensitive accounts.
Does this tool store my password? Never — it is checked in-memory only and discarded the moment you navigate away.