The maximum size for a single Windows file is determined by the operating system, storage device, and file system. On 32-bit systems running the FAT16 or FAT32 file systems, the maximum file size is limited to 4 gigabytes (GB). On 64-bit systems running NTFS, the maximum file size is limited to 16 exabytes (EB). For individual documents, such as text files and image files, the maximum size is often limited to 2 GB or 2000 words.