Password & Data Breach Exposure Checker

Verify whether your password has appeared in major corporate data breaches using the mathematical k-Anonymity model. Your password never leaves your browser in plain text.

Interactive Password & Data Breach Exposure Checker
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Formula & Calculation Methodology

k-Anonymity Model: SHA1(Password) -> 5-char prefix sent to API -> 35-char suffix matched locally on client.

SHA1(Password) 
ightarrow [Prefix_5, Suffix_{35}]

Step-by-Step Worked Example

Password tested: password123

  1. Local SHA-1 Hash: CBFDAC6008F9CAB4083784CBD1874F76618D2A97
  2. Transmitted Prefix: CBFDA
  3. Local Suffix Match: C6008F9CAB4083784CBD1874F76618D2A97
  4. Breach Database Hits: 12,450,890 times (Critical Risk!)
Result: Critical Breach: Leaked 1.2 Crore+ times. Change immediately!

Frequently Asked Questions

Is it safe to type my password into this breach checker?

Yes, 100% safe. The tool uses mathematical k-Anonymity: your plain-text password is never sent across the internet. Only the first 5 characters of its SHA-1 hash are queried to fetch anonymous hash collections.

What should I do if my password is found in data breaches?

Change the password immediately on all accounts where you have used it, and enable Two-Factor Authentication (2FA/MFA) using an authenticator app.

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