About ICS Calendar Event Generator

Build a standards-compliant .ics event file — import to any calendar. Part of the DevTools Surf developer suite. Browse more tools in the Date / Time collection.

Use Cases

• Event organizers distributing calendar invites via download links
• Marketing teams creating 'Add to Calendar' buttons for webinars
• HR departments sharing company holiday schedules as .ics files
• Conference organizers letting attendees import session schedules

Tips

• Fill in start, end, and summary for a valid .ics file
• The generated file imports into Google, Apple, and Outlook
• Add RRULE fields for recurring event definitions

Fun Facts

• The iCalendar format (.ics) was standardized in RFC 2445 in November 1998, and later updated as RFC 5545 in 2009 — it remains the universal calendar interchange format.
• The VCALENDAR container format was influenced by vCard, the electronic business card standard — both use the same 'V' prefix naming convention from Versit Consortium (1996).
• Google Calendar, Apple Calendar, and Microsoft Outlook all natively support .ics files, making it the only calendar format with true cross-platform interoperability.

FAQ

What is ICS?

RFC 5545 iCalendar format — the universal standard for calendar events. Supported by Google Calendar, Apple Calendar, Outlook, etc.

What fields are supported?

Summary, description, start, end, location, attendees, organizer, recurrence rules, alarms, URL. Everything an event needs.

Recurring events?

Yes — RRULE support (every N days/weeks/months/years, on specific weekdays, until a date). Plus EXDATE for exceptions.

Can I email the ICS file?

Send as attachment. Most clients auto-detect and offer 'Add to calendar'. Inline ICS in email bodies works in some clients too.