Check whether a password is easy to crack and learn how to make it stronger.
Who this is for
Anyone checking whether a password is weak, okay, or strong enough.
What to type in
The password you want to test. It stays local.
Start with the assumptions, then use the interpretation below to compare tradeoffs without bouncing between sections.
Paste the password and the calculator will score it locally on your device.
Use these inputs as a quick setup row. The answer and visual breakdown sit below so you do not lose context.
Analyzed locally. Never transmitted.
Password check
The model estimates about 0 bits of entropy and an effective length of 0 characters.
In the fast offline attack model, the estimated crack time is Instantly.
Length usually helps more than complexity theater. A longer passphrase beats a short, tricky string.
This is local estimation, not a guarantee. Reuse and phishing still break strong passwords.
If the label is below strong, make it longer first instead of only swapping in symbols.
Use a password manager so every important account gets a unique password.
Results
Relative comparison of your main outputs
Entropy
0.0
Effective length
0
Strength
No password
Entropy
0.0
Effective length
0
Offline crack time
Instantly
Use this if you want to understand how the calculator works, not just plug in numbers.
Step 1
Enter a password in the input field.
Step 2
Review the strength label, entropy bits, and effective length.
Step 3
Check crack-time estimates across online and offline attack models.
Step 4
Follow feedback suggestions to improve weak areas.
These cover the assumptions, tradeoffs, and edge cases behind the calculator.
Use the calculator for the math, then use these guides to make the decision with more confidence.