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Most online calculators and converters upload your financial data, salary numbers, and identity photos to backend servers. UseCOS is engineered on a fundamental zero-server-upload architecture.
Architecture verified: July 31, 2026When you resize a passport photo, convert exam signatures, or compute mortgage payments, all image compression and math happens 100% locally inside your device's browser memory via HTML5 Canvas and JavaScript. Zero files or numbers are sent over the network.
UseCOS does not use cross-site tracking cookies, fingerprinting pixels, or invasive third-party ad trackers. We do not build behavioural profiles or sell financial inquiry intent to lenders, brokers, or data brokers.
Calculator values and image blobs exist solely in volatile RAM during your active session. Closing the browser tab instantly purges all inputs from memory.
Because all computation runs in the browser, anyone can open their browser Developer Tools (`Network` and `Sources` tabs) and independently verify that zero outbound API requests transmit your uploaded photos or salary data.