How to check whether a "client-side" web tool really stays client-side

<p>"Processed in your browser." "Your files never leave your device." "100% client-side."</p> <p>Those sentences cost nothing to write. I've audited a dozen tools that say them, and the claim is true for maybe half. The failure mode is rarely a lie — it's usually a half-truth: the <em>preview</em> is local, the export is uploaded; or the file is uploaded but "only for processing"; or the compressi

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