Yes. Upscaling images on FormatGrid is completely free, with no watermarks, file limits, or account sign-up required.
Nowhere. Your images never leave your device — FormatGrid never uploads, transmits, or stores them on any server. All processing happens locally in your browser's memory and is discarded once you close or refresh the tab.
FormatGrid enlarges your image using the same local WebAssembly image engine that powers every other image tool here, then re-encodes it at your chosen format and quality — all on your device, nothing uploaded.