Runs entirely on your local device. Your files never leave your device.
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Yes. Merging PDFs on FormatGrid is completely free, with no page count limits, file size caps, watermarks, or account sign-up required.
Nowhere. Your files never leave your device — FormatGrid never uploads, transmits, or stores them on any server. All merging happens locally in your browser's memory and is discarded once you close or refresh the tab.
Standard tools upload your files to a remote server, process them in a queue, then send the result back — three network round-trips before you get anything. FormatGrid processes everything locally on your device's CPU the moment you select your files, so there's no upload, no queue, and no download wait.