Password Strength Checker

What it does

Check how strong a password is with a live score (0 – 4), a color bar, entropy bits, and an estimated time-to-crack at 10 billion guesses per second. A checklist flags missing criteria (length ≥ 12, uppercase, lowercase, digits, symbols, no common patterns). The tool also warns on common passwords like “password” or “123456”.

Nothing ever leaves your browser — no network calls, no logging. For generating strong passwords use password generator; to check if a password is already in a breach, password breach checker.

How to use it

1. Type the password you want to evaluate.
2. Read the strength score and entropy estimate.
3. Fix any items the checklist flags red.
4. Aim for “Strong” or better before using the password.