Find out how strong your password really is with the free Password Strength Checker from Blanza Tools. It analyzes entropy, estimates how long the password would survive a cracking attack, and gives concrete tips to make it stronger. The check runs 100% in your browser — your password is never sent to any server. Pair it with our Password Generator for passwords that are both strong and unique.
Test your password strength with our free checker. It estimates entropy, crack time and shows exactly what to improve. Checked 100% in your browser — your password is never sent anywhere.
How to use
Type the password you want to test.
See the strength rating, entropy and crack-time estimate.
Follow the tips to harden it.
Frequently Asked Questions
Is it safe to type my real password here?
Yes — the analysis runs entirely in your browser with JavaScript. Nothing is transmitted, stored or logged anywhere.
What does “entropy” mean?
Entropy (in bits) measures how unpredictable your password is. More bits = more guesses an attacker needs. Aim for 60+ bits for important accounts.
How is crack time estimated?
We estimate how long a powerful offline attack (10 billion guesses per second) would need. Real attacks vary, but it is a useful relative measure.
What makes a password strong?
Length matters most: 16+ random characters mixing letters, numbers and symbols. Avoid words, patterns and reuse across sites — a password manager helps.