iCal Generator

Generate iCalendar (.ics) files for calendar events.

Event Details
Organizer & Attendees
Reminder & Recurrence

What Is an iCalendar (ICS) File?

iCalendar (iCal) is a standardized file format (RFC 5545) for exchanging calendar and scheduling information. Files use the .ics extension and can be imported by virtually every calendar application — Google Calendar, Apple Calendar, Microsoft Outlook, Thunderbird, and more. When you receive a meeting invitation by email, it typically contains an ICS file attachment.

ICS File Structure

An ICS file contains structured text with specific properties:

  • BEGIN:VCALENDAR — Marks the start of the calendar data.
  • BEGIN:VEVENT — Defines an individual event.
  • DTSTART / DTEND — Event start and end times in UTC format.
  • SUMMARY — The event title.
  • DESCRIPTION — Detailed event description.
  • LOCATION — Event venue or meeting URL.
  • RRULE — Recurrence rule for repeating events (daily, weekly, monthly).
  • VALARM — Defines reminders/alerts before the event.

Common Use Cases

  • Event Invitations: Generate ICS files for webinars, meetings, and conferences that recipients can add to their calendar with one click.
  • Booking Confirmations: Attach ICS files to hotel, flight, or appointment confirmation emails.
  • Marketing Events: Add "Add to Calendar" buttons on event landing pages by linking to generated ICS files.
  • Recurring Schedules: Create recurring events (weekly team meetings, monthly reviews) with proper RRULE configuration.
  • Reminders: Include VALARM components to trigger notifications before events.

How to Use This Tool

  1. Enter the event title, description, and location.
  2. Set the start and end date/time with timezone.
  3. Add optional fields like organizer, attendees, and recurrence.
  4. Click Generate and download the .ics file.

Why Use This Tool?

  • Create calendar events compatible with all major calendar apps.
  • Works with Google Calendar, Outlook, Apple Calendar, and more.
  • Generate recurring events with complex schedules.
  • No sign-up required — generate and download instantly.

Frequently Asked Questions

Will the ICS file work with all calendar apps?

Yes. The iCalendar format is an open standard (RFC 5545) supported by Google Calendar, Apple Calendar, Microsoft Outlook, Yahoo Calendar, Thunderbird, and virtually all modern calendar applications.

Can I include time zones?

Yes. ICS files support time zone information through the VTIMEZONE component or by appending a time zone identifier to date-time values (e.g., DTSTART;TZID=America/New_York).