Do I know this?

Enter text or choose a file. We’ll create its fingerprints locally and check where it has appeared.

Your text

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Check whether the fingerprint of some text or a file has appeared here before—without sending the original content.

1
Create fingerprints locally
Your browser calculates every displayed fingerprint directly from the exact text or file bytes.
2
Check one fingerprint
Only the SHA-256 fingerprint, input type, and byte count are sent for the lookup. Your text and file contents never leave your browser.
3
See where it appeared
Results show which countries have checked the same fingerprint, plus when each country first and most recently saw it.

Traffic and location

Requests include an IP address and browser user agent, as they do on any website. The IP is matched against a local country database, used for rate limiting, and retained with the user agent in private traffic records. Neither is shown in public results or live activity.

Enter a SHA-256 fingerprint to see the exact JSON returned by the API.

GETiknowthis.org/e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

Response— msLoading…

{
  "firstSeenUtc": null,
  "lastSeenUtc": null
}