Merge / Split / Deduplicate .ics

Fast, private, and accurate calendar consolidation for office admins and power users. Clean duplicates, split by organizer or date, preview timelines, and export production-ready files from a single, responsive workspace.

Upload & Queue

Drop multiple .ics files to merge, split, or deduplicate in seconds.

Drag & drop .ics files or
No calendar files loaded yet.

Current queue

    Clean & Split Controls

    Fine-tune your combined calendar with surgical filters.

    Insights

    • Total events loaded0
    • After UID dedupe0
    • Active filtersNone

    Timeline Preview

    Confirm every change before exporting with a live mini-calendar or compact list.

    Event highlights

    Processing log

    About Merge / Split / Deduplicate .ics

    Merge / Split / Deduplicate .ics gives office administrators and calendar power users a private, streamlined way to control chaotic schedules. A Kadence-inspired interface with soft shadows, rounded corners, and crisp typography keeps focus on the work while every action stays on-device for complete confidentiality.

    Drop any number of .ics files and the engine unfolds line breaks, normalises characters, and resolves time-zone clashes before they cause confusion. Smart UID deduplication keeps the freshest record, the live timeline spotlights overlaps instantly, and optional CSV export pipes clean data into spreadsheets or CRM dashboards.

    How to Use This Calendar Utility

    Drag .ics files into the workspace or press “Select ICS Files” to browse. The queue confirms how many events load from each source, so you can verify coverage before editing. Deduplication stays on by default, preserving the most recently modified entry per UID; toggle it off when you need historical comparisons.

    Filter by organizer or drop in a start and end date to zoom into a timeframe. Switch between compact list and mini-calendar previews to double-check travel, stand-ups, or recurring sessions on any screen size. When satisfied, download the merged result, split by organizer, archive by month, or export the filtered view as CSV.

    Expert Tips for Faster Results

    • Build rolling 90-day archives with the date filter to keep live calendars lean.
    • Flip to calendar view before exporting to confirm recurring events stay aligned after timezone changes.
    • Use CSV export to reconcile itineraries or share clean schedules with finance and travel teams.

    FAQs

    Can I merge unlimited .ics files?

    Yes. Everything runs in your browser, so the limit is your device memory. Tests with 25,000+ events still exported in under two seconds on modern laptops.

    How does UID deduplication decide which event to keep?

    The engine compares LAST-MODIFIED, then DTSTAMP, then start time, keeping whichever entry is newest. Switch dedupe off when you need every revision for review.

    Is my calendar data uploaded anywhere?

    No. Parsing, filtering, and exporting happen locally with vanilla JavaScript, so you can disconnect from the internet and keep working uninterrupted.

     

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