Free calendar file tools

Merge ICS Calendar Files

Combine calendars while keeping recurring events, edited instances, alarms and time-zone definitions.

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.

Exact duplicate event records are removed. Different revisions with the same UID are kept and flagged. Conflicting definitions of the same time zone stop the merge.

How to use this tool

Choose at least two ICS files or load the two-file example.
Review duplicate and revision warnings.
Download the combined calendar; originals stay untouched.

Before you export

Are duplicates removed?＋

Only exact copies of the same event record. A changed event sharing a UID is kept, because choosing the correct revision needs a human decision.

Do repeating events survive?＋

The recurrence rules and their exception records stay in the output. This tool does not expand or rewrite the series.

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