How to Use Password Strength Checker
Measure how strong a password is: it estimates entropy in bits, an offline time-to-crack, and checks length and character variety — all in your browser, so the password is never sent anywhere.
Open the Password Strength Checker tool →What is Password Strength Checker?
Test a password's strength, entropy and estimated time to crack — privately. It's completely free, needs no sign-up, and runs entirely in your browser — so it's fast and private.
How to use Password Strength Checker
- Open the Password Strength Checker tool.
- Enter your values or options.
- The result updates instantly as you type.
- Use or copy the result. Everything runs in your browser — nothing is uploaded.
Frequently asked questions
Is my password sent anywhere?
No — it's analysed entirely in your browser and is never transmitted or stored.
How is the strength estimated?
From entropy — the character variety (pool size) and length — plus an estimated offline time-to-crack. It's a guide, not a guarantee.
What makes a password strong?
Length matters most. A long passphrase with mixed character types is far harder to crack than a short complex one.
Ready to try it?
Open Password Strength Checker →