Runs entirely on your local device. Your files never leave your device.
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Yes. Choose All Pages, First Page Only, Last Page Only, or a Custom selection like "1,3,5-7" to apply the watermark exactly where you want it.
Nowhere. Your files never leave your device — FormatGrid never uploads, transmits, or stores them on any server. All watermarking happens locally in your browser's memory and is discarded once you close or refresh the tab.
The preview mirrors the same position, rotation, scale, and opacity math used to generate your final file, so what you see is a close, real-time approximation of the actual output before you commit to processing the full document.