Free calendar file tools

Split ICS Files for Calendar Import

Break a large calendar into smaller valid files, keeping each recurring series and its exceptions together.

Calendar won’t import?Start with the import checklist

Your file

Preview

Waiting for a file

Know what you’re importing.

See event dates, check time zones, and spot warnings before opening your calendar app.

Your calendar account is never connected.

Choose a byte budget below your importer’s limit. Each file keeps calendar metadata and time zones. A single oversized series is reported, never silently broken.

How to use this tool

Open a large ICS export.
Set the maximum kilobytes per output file.
Download a ZIP and import each numbered ICS separately.

Before you export

Why might splitting be impossible at my chosen size?＋

One recurring event family, or the calendar’s time-zone definitions, can exceed the budget alone. Raise the budget or remove unnecessary content from a separate copy.

Will splitting remove duplicate imports?＋

No. It controls file size only. Import into a new calendar and inspect it before replacing an existing calendar.

Uses the iCalendar standard. Keep the original file and test the output in your receiving calendar app.