Password Strength Checker
Type or paste a password to see an instant strength estimate. The checker considers length, character classes, repetition and a small list of common passwords, then estimates how long an offline brute-force attack would take. Your input never leaves this tab.
How to use
- 1
Type or paste your password
Use the input field above. The checker analyses the value as you type — there is no submit button to click. Toggle the eye icon to reveal or hide the value.
- 2
Read the strength meter
The coloured bar and label show a quick verdict (weak, fair, good, strong). The entropy figure underneath estimates how many bits of randomness your password contains.
- 3
Review the reasoning
The “Why this rating?” panel lists specific issues — short length, missing character classes, repeated characters or membership in the common-password list.
- 4
Use the verdict to improve
Pick a longer, more varied password based on the suggestions, or use the related Password Generator to spin up a strong random one.
Common use cases
- Sanity-check a password you are about to reuse before signing up.
- Audit the strength of passwords exported from your password manager.
- Teach friends and family why “Password123” is risky.
- Compare memorable passphrase ideas against random-string alternatives.
Limitations
- This is a heuristic estimator, not a full zxcvbn-style model. It may over-rate some patterns.
- The common-password list is intentionally small — it will not catch every leaked password.
- Strength does not account for where the password is reused. A “strong” reused password is still a liability.
Frequently asked questions
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