Password Strength Checker

See how strong your password really is. Live score, what's missing, and how to fix it. Runs in your browser — nothing leaves it.

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Password Strength Checker — Score Any Password Instantly

This free checker scores the strength of any password in real time, estimates its entropy in bits, and shows exactly which criteria it meets and which it is missing. Weak passwords are the most common cause of account takeovers — a quick check helps you avoid using them. Because everything runs in your browser, your password is never sent anywhere.

What Makes a Password Strong?

Strength comes mostly from length, then from diversity (upper and lower case, numbers, symbols) and unpredictability (no dictionary words, names, dates, or repeated patterns). A 16-character password with mixed character types is dramatically harder to crack than an 8-character one, even if the 8-character one includes symbols. This tool scores on exactly those dimensions.

How Does the Score Work?

The checker estimates the number of possible combinations (entropy) based on your password's length and character set, then scores it on a 0–100 scale and assigns a label from Very Weak to Very Strong. It also flags common weaknesses — too short, missing character types, a common word, or a repeated/sequential pattern — and lists concrete ways to improve it.

Password Strength FAQ

Is my password stored? No — analysis happens locally in your browser; nothing is uploaded or saved. What is a good score? Aim for Strong or Very Strong before using a password on a real account. Should I rely on the score alone? Use it as a guide, and always use a unique password per account plus two-factor authentication where available. How long should a password be? 12–16 characters minimum; 20+ for critical accounts.