Password Strength Checker
Test a password strength by entropy in your browser and get specific tips to improve it. Nothing is sent anywhere. Free.
Check password strength
Type a password to see its estimated strength. It is checked in your browser and never sent anywhere.
What this strength checker does
Common use cases
- 1Testing a password before using it
- 2Comparing two candidate passwords
- 3Teaching good password habits
- 4Auditing a weak password
- 5Setting a policy baseline
- 6Sanity-checking a generated password
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About password strength
Strength here is measured as entropy in bits — how many guesses an attacker needs on average. It comes from the password's length and the size of the character pool it draws from, so a longer password with mixed character types scores far higher.
Entropy is only a proxy: it assumes the password is random. A password that looks complex but is a common word or pattern is weaker than its entropy suggests. Use unique, generated passwords stored in a manager, and this check happens entirely in your browser.
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How is strength measured?
As entropy in bits, derived from the password length and the size of the character pool it uses — a proxy for how hard it is to brute-force.
Is my password sent to a server?
No. It is analysed entirely in your browser and never transmitted, so it is safe to test a real password.
Does it detect reused or common passwords?
No. Entropy measures brute-force resistance only — it cannot tell if a password is a common word or reused. Always use unique passwords.
What score is good?
Aim for the Strong or Very strong bands, which need roughly 60+ bits — typically 12 or more characters with mixed types.