Apple iCal document file
File type: Document file
The *.icaltodo file extension is associated with Apple iCal, the calendar and task-management application included with Mac OS X and macOS.
An *.icaltodo file contains an Apple iCal document.
File type category:
Document file
Date updated: October 2, 2026
Apple iCal was Apple's personal calendar and schedule-management application for Mac computers. It was later renamed Apple Calendar and is included with macOS.
The *.icaltodo file is an Apple iCal document associated with calendar task data.
Open an *.icaltodo file with Apple iCal or Apple Calendar on a Mac.
If Apple iCal or Calendar can open the file, export its calendar or task data to a supported iCalendar file, such as an .ics file.
Software applications that can open icaltodo files:
Apple macOS / Mac OS X
Software capable of saving icaltodo files:
Apple macOS / Mac OS X
Software apps that create icaltodo files:
Apple macOS / Mac OS X
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