Is my password sent to your servers?

No. All analysis happens inside your browser. Your password never leaves your device.

How is the strength score calculated?

The score is based on Shannon entropy: the tool calculates the character set size and raises it to the power of your password length to estimate possible combinations.

Does a perfect score mean my password is unbreakable?

No password is mathematically unbreakable, but a high score makes cracking it impractical within any reasonable timeframe.

Are repeated characters penalized?

Yes. The tool detects repetition and common patterns like sequential numbers or keyboard walks and reduces the score accordingly.

What is the minimum recommended password length?

Most current security guidelines recommend at least 12 characters, though character diversity matters as much as length.

Can I use this to test passphrases?

Yes. Long passphrases made of random words often score very well because their length dramatically increases entropy.

Password strength checker — Free Online

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100% in-browser — your password is NOT sent to any server: All analysis runs in JavaScript on your device. Open DevTools → Network; you will see no POST/fetch calls on this page.
Still avoid pasting real production passwords — habit matters.

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