Free Tool
Password Strength Checker
Test how strong your password is. See its entropy, estimated crack time, and which security requirements it meets. Checked privately in your browser. No signup.
Your password is checked entirely in your browser and never sent anywhere.
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Strength
0 bits
Entropy
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Est. Time to Crack
Requirements
Why It Matters
Know How Strong Your Password Really Is
Not all passwords are created equal. Length and variety of characters matter far more than swapping a letter for a symbol. This checker measures the actual strength of a password by estimating its entropy — how unpredictable it is — and roughly how long it would take to crack.
Use it to test your passwords or teach good habits. And rest assured: nothing you type is transmitted — the check happens entirely on your device.
FAQ
Questions About This Tool
Yes. The password is analyzed entirely in your browser using JavaScript — it is never sent over the internet, stored, or logged anywhere.
Length above all, followed by a mix of uppercase, lowercase, numbers, and symbols. A long passphrase of random words is often stronger than a short complex one.
Entropy measures how unpredictable a password is, in bits. More bits means exponentially more guesses needed to crack it. Above 60 bits is strong; 80+ is very strong.
It's a rough estimate assuming a fast offline attacker making billions of guesses per second. It's meant to illustrate relative strength, not a precise guarantee.
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