Password strength checker
Estimates how strong a password is and why.
- Free
- No sign-up needed to try
- Runs in your browser
Sign in to use this tool
Password strength checker is free once you're signed in — one quick account unlocks every tool on Alux Tools, no payment, ever.
How this works
Scores length and character variety to estimate entropy, and lists the specific weaknesses found.
Your password is checked locally and never leaves this page.
Frequently asked questions
Is the password strength checker free?
Yes. Password strength checker is free to use, with no software to install and no hidden fees.
Is my data uploaded anywhere?
No. This tool runs entirely in your browser, so what you enter or select never leaves your device.
Does it work on phones and tablets?
Yes. It works in any modern browser on Android, iPhone, iPad, Windows, Mac and Linux.