Working area

Test password strength before you reuse it

Paste a candidate password and review the live strength score, entropy estimate, and warning checks. The analysis stays in your browser.

Very weak0 bitsLocal only

Password input

Check a password

Password

Analyzed locally. Do not paste a live production secret into shared screens.

Improvement tips

Use at least 12 characters with mixed letters, numbers, and symbols.

Generate a stronger password How to use

Result

Strength report

0/100

Very weak0%

Entropy

0 bits

Charset

—

Crack hint

Enter a password to see the estimate.

Checks

Detailed findings

Input

info

Paste or type a password to start the strength check.

GuideHow it works3 steps

Paste or type a password

Enter the password you want to evaluate. Analysis runs locally in your browser.

Review strength and warnings

Check the score, entropy estimate, character coverage, and pattern warnings in one report.

Improve or generate a better one

Use the tips, then open the Password Generator if you need a stronger replacement.

More toolsRelated tools

Password Generator

Create strong random passwords with length, symbol, and readability controls.

Hash Generator

Generate SHA-256, SHA-384, and SHA-512 hashes from text or files in the browser.

Password Strength Checker Guide

Learn how the strength score works and how to improve weak passwords.

FAQFrequently asked questions

Is my password sent to a server?

No. The checker runs entirely in your browser. The password stays on your device and is not uploaded or stored by this tool.

What does password entropy mean?

Entropy is an estimate of how hard a password is to guess based on length and character variety. Higher entropy usually means stronger resistance to brute-force attacks.

Why can a long password still score poorly?

Common words, repeated characters, sequences like 1234, or keyboard patterns reduce strength even when the password looks long.

Should I reuse a strong password?

No. Use a unique password for each important account, ideally with a password manager, even when the strength score looks excellent.

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