01
Choose an ICS file
Open one UTF-8 iCalendar export from your device.
Business Tools
ICS Calendar File Splitter
Split a large ICS calendar into smaller import-ready files while keeping timezone definitions and same-UID event groups together.
Choose one ICS calendar
Split an iCalendar export into smaller files for import. Up to 10 MB. Every output keeps its VTIMEZONE blocks, and events with the same UID stay together.
Data handling
Storage and export controls
- Retention
- The tool's working state is kept only while this page is open. Inputs and results are not saved to persistent storage by Got A Tool.
- Export
- The tool may prepare a result after you run it. It downloads or copies it only when you choose that action.
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How it works
Split a calendar without separating recurrence groups
02
Set the event limit
Choose how many events each import file should contain.
03
Download the ZIP
Each part includes calendar properties and its timezone definitions.
Safe boundary
Same-UID events remain together.
Recurring events and exceptions can share a UID. This tool treats them as one group, even if that makes a part exceed your chosen event limit. It rejects other top-level calendar component types instead of silently dropping or duplicating them.
VTIMEZONE copied
Each output includes the source timezone definitions.
No upload
The calendar is split in your current browser tab.
Import-ready files
Outputs use CRLF line endings and standard line folding.
No time conversion
Event timestamps and timezone labels are copied, not reinterpreted.
Keep working
Related tools
ICS Timezone Normalizer
Normalize known Windows timezone labels in an ICS file without shifting event times or deleting recurrence rules.
Open tool →ICS Calendar to CSV Converter
Convert calendar events to CSV without shifting original event times.
Open tool →Google Calendar CSV Import Prep
Validate calendar rows and download a Google Calendar-ready CSV or one-time ICS file without guessing dates.
Open tool →