Password Strength Checker
See how strong a password is, with its length and estimated entropy. Runs entirely in your browser — the password is never sent or stored.
How it works
- 1
Type a password
Try a similar one, not your real password.
- 2
See the rating
From very weak to very strong.
- 3
Read length and entropy
Longer and more varied is stronger.
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Watermarks added
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Devices supported
Frequently asked questions
No, the check runs entirely in your browser. Still, avoid typing your real passwords into any website.
What makes a password strong
Length matters most: every extra character multiplies the number of guesses an attacker needs. Mixing lowercase, uppercase, digits and symbols widens the character pool and adds more. Common passwords like "password" or "123456" are weak no matter how they look.
Entropy is an estimate of unpredictability in bits; above roughly 60 bits is decent, above 80 is strong. This is a rough guide, not a guarantee. Use a password manager to create and store long random passwords, and enable two-factor authentication where you can.