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No, for every calculator marked "🔒 Runs entirely in your browser" (the great majority of the 93 live tools) — that label means exactly what it says: your inputs never leave your device, there's no server round-trip, and nothing is logged. A small number of tools are marked "☁️ Processed on our servers" instead, because the work genuinely can't run client-side (a format the browser itself can't decode, for example) — those tools say so plainly, and any file sent is deleted automatically within 60 minutes. Check the label at the top of any tool page to see which applies to that specific tool.