The easiest and most reliable way to move ICS calendar files to Gmail is by using the SysInfo ICS to CSV Converter. This tool helps you convert your calendar files into Google CSV format, which is supported by Gmail. You can add one or many ICS files at once, and the software will handle them without any size limit. It also lets you see your calendar details before converting and gives options to choose a specific date range or remove duplicate events. All your meetings, tasks, and schedules stay safe and unchanged during the process. The tool is simple to use, even if you're not tech-savvy, and it works on all Windows versions, including Windows 11.