Password Strength Checker
Check how strong a password is, with an entropy score and estimated crack time.
About Password Strength Checker
Test the strength of any password and understand why it's weak or strong. See an entropy score, an estimated time to crack it under a fast offline attack, and a checklist of best-practice requirements. Everything is evaluated locally — your password is never transmitted or stored.
How to use Password Strength Checker
- 1
Type or paste the password you want to test.
- 2
Review the strength meter and entropy score.
- 3
Check the estimated crack time and the requirements checklist.
- 4
Adjust your password until it meets every requirement.
Frequently Asked Questions
Is it safe to type my real password here?
The analysis runs entirely in your browser and nothing is sent or saved. That said, as a habit, avoid pasting active passwords into any website you don't fully trust.
How is crack time estimated?
We estimate entropy from the character set and length, then assume a fast offline attacker guessing about 10 billion times per second. Real-world times vary with hardware and attack method.
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