Combine multiple audio tracks into a single file.
Yes. Merging audio files on FormatGrid is completely free, with no watermarks, file limits, or account sign-up required.
Nowhere. Your audio files never leave your device — FormatGrid never uploads, transmits, or stores them on any server. All audio merging happens locally in your browser's memory and is discarded once you close or refresh the tab.
Most online audio mergers upload your files to a remote server, process them there, then download the result back. FormatGrid performs every step locally on your device, eliminating upload time, processing queues, and download delays.