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ICS

iCalendar

ICS is the interchange format for calendars — Google Calendar, Apple Calendar and Outlook all import and export it. One file can hold a single invitation or an entire multi-year calendar with recurrence rules, alarms and attendees.

Extensions: .ics .ical .ifb
MIME type: text/calendar
Also called: iCal, iCalendar

01 Convert ICS to something else

ICS to CSV Your calendar as a spreadsheet, with Google and Outlook presets.
ICS to JSON Structured events, ready for a script.

02 Convert something else to ICS

CSV to ICS Turns a schedule in a spreadsheet into an importable calendar.

03 Related formats

Opening a .ics file

If you landed here because something handed you a .ics file and nothing on your machine will open it, converting it to a format you already have a reader for is usually faster than installing new software. Every conversion above runs in this browser — the file is not uploaded, so it works on a locked-down work machine and on a file you are not allowed to send anywhere.