Password Strength Checker
Test how strong a password is, privately.
Test how strong a password is. This tool estimates its entropy, rates its strength, and shows a rough time-to-crack, with tips to improve it. Your password is analyzed entirely in your browser and never sent anywhere.
Your password is analyzed entirely in your browser and never sent anywhere. This is an estimate — real-world strength also depends on avoiding common words and reuse.
Runs entirely in your browser — nothing is uploaded.
How to use the password strength checker
- 1Type or paste a password.
- 2See its strength rating and entropy.
- 3Follow the tips to make it stronger.
Frequently asked questions
Is it safe to type my password here?
Yes — the analysis runs entirely in your browser and nothing is transmitted or stored. Still, avoid testing a password you're actively using anywhere sensitive.
What is entropy?
Entropy measures unpredictability in bits — higher is stronger. It grows with password length and the variety of characters used.