ICS Viewer Online

An online ICS viewer for organizers and developers to inspect, filter, and export events from calendar files or ICS URLs.

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About This Tool

ICS Viewer Online ingests calendar data in ICS format and presents events in a structured, searchable view. It is designed for developers, schedulers, and coordinators who receive calendar data via ICS files or URLs and need a quick, reliable way to validate timings and extract event details.
The tool conceptually parses RFC 5545 components, resolves time zones with IANA data, expands recurring events, and returns a normalized event list with fields such as start, end, summary, location, and UID. It supports all-day events and preserves time zone information for accuracy across regions. By providing a single source of truth for calendar data, it enables downstream workflows like reporting, planning, and integration with other systems without requiring desktop calendar clients.
Unique value comes from strict RFC5545 parsing, robust recurrence expansion within a user-specified window, and seamless export options (CSV or ICS) that preserve exact times and zones. Typical use cases include project planning, event coordination, HR scheduling, and software deployment calendars where timely, accurate event data is essential.

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How to Use

Provide inputs: upload an ICS file or enter a publicly accessible ICS URL.
Configure options: set an optional date window and whether to include all-day events.
Run parse: the tool reads the ICS source, resolves time zones, and expands recurrences.
Review outputs: inspect the resulting event list, search by keyword, or filter by date/location.
Export results (optional): download as CSV or re-export as ICS for calendar import.

Frequently Asked Questions

Find Quick Answers

What inputs does the ICS viewer accept?

The tool accepts either a public ICS URL or an uploaded ICS file. It validates the ICS format, resolves time zones, expands recurring events, and returns a structured list of events within the requested date window.

How are recurring events handled?

Recurring rules (RRULE) are expanded to individual instances within the specified date range. Time zones are applied per instance using IANA tz data; EXDATE exceptions are respected where present.

Can I export the results?

Yes. Parsed events can be exported as CSV for spreadsheet processing or re-exported as ICS for calendar import. Exports preserve start and end times in ISO 8601 with time zone information.

What happens with invalid data?

Invalid ICS data triggers structured error codes in the results and missing or skipped events. Large files or unreachable URLs may be throttled or gracefully degraded with partial results.

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