Password Strength Checker

Test how strong a password is with an entropy-based crack-time estimate that updates as you type, plus specific improvement tips. Checked 100% locally — the password never leaves your device.

100% free No uploads Runs in your browser No signup

Password strength checker

Password

Checked entirely on this page — nothing is transmitted or stored.

The best password is one you don't have to remember: use a password manager and a unique random string per site. Length beats complexity — a six-word passphrase is stronger than P@ssw0rd!. Reusing a password anywhere is the single biggest risk.

How to use the Password Strength Checker

1
Open the tool above — it is already running, no install or account needed.
2
Enter your input and adjust the options to match what you need.
3
Copy or download the result — everything was processed locally in your browser.

Private by design

This tool runs 100% inside your own browser using local JavaScript — your input never touches a server. That makes it instant, offline-capable in many cases, and private even for sensitive data.

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