Observed arrival · 2026-09-05

I Know This — the fingerprint checker that keeps your files local

iknowthis.org Observed source

Editorial interest 77/100 Selection signal · not a rating of the site

A browser tool that creates SHA-256 fingerprints for text or files, then checks whether the fingerprint has appeared on the site before.

Landing page captured for the 2026-09-05 issue.

Why it surfaced

The premise is unusually concrete: the browser sends only a SHA-256 fingerprint, input type, and byte count, never the original material. It is also candid about its unfinished state—the lookup database is not connected yet—but already explains a surprisingly detailed privacy model.

A browser tool that creates SHA-256 fingerprints for text or files, then checks whether the fingerprint has appeared on the site before.

Observed signals

Read the marks

Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

◎NicheUnusually specific use

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