Password strength checker — how it works
Our password strength checker helps you answer how strong is my password without signing up or sending data over the network. The page scores length, character variety (uppercase, lowercase, numbers, symbols), obvious patterns, repetition, and a blocklist of common passwords. It also estimates password entropy in bits and rough crack time for two guess rates so you can compare online throttling versus offline hashing attacks — useful context, not a guarantee of safety.
Why use a browser-only password tester?
Many “check my password” services upload your secret to a server. This tool is different: nothing leaves your browser, which is ideal when you want a password security checker for real credentials. For maximum safety, still avoid reusing passwords across sites, turn on two-factor authentication, and use a reputable password manager to generate and store unique secrets.
Limits of any password analyzer
Entropy and crack-time numbers assume random drawing from a known character pool. Human-chosen passwords are often more predictable than that. Use this password analyzer as guidance: prefer long, unique passphrases or random strings, and never share passwords across accounts.