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Password Strength Checker

Test how strong a password is with entropy, character checks and a crack-time estimate.

Check a password

Strength: —
Entropy: —
Offline crack time: —
At least 12 characters
Contains uppercase letters
Contains lowercase letters
Contains digits
Contains symbols
No long repeated runs
Your password is analysed locally and is never sent anywhere.

How to use the Password Strength Checker

  1. Type or paste the password you want to test.
  2. Read the strength, entropy and estimated crack time.
  3. Use the checklist to see which character types are missing.

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Frequently Asked Questions

Common questions about the free online password strength checker.

The checker estimates entropy in bits from the password length and the size of the character pool it uses.
No. The analysis runs entirely in your browser and the password is never transmitted or stored.
Below 40 bits is weak, 40 to 60 is fair, 60 to 80 is strong, and above 80 bits is very strong.
It assumes an offline attack trying ten billion guesses per second, which is realistic for modern dedicated hardware against a fast hash.
Length matters most, but mixing in symbols, digits and both letter cases grows the search space further.
No. Use a password manager to create and store unique passwords, and use this tool to check how strong they are.
Yes. The checker is fully responsive and works on desktop, tablet and phone.
Yes, it is completely free with no account required.

Last updated: October 10, 2026