iCal/ICS Event Generator - Create a Calendar Event File Online
iCal/ICS Event Generator
Build a .ics Calendar Event File
Understanding .ics Calendar Files
Universal Calendar Format
The iCalendar (.ics) format is the standard for calendar events — Google Calendar, Outlook, and Apple Calendar all import it directly.
Common Uses
Event invitations, "Add to Calendar" buttons on websites, and webinar reminders typically send an .ics file.
All-Day Events
Toggling "All-day event" switches the file to use date-only values, which every calendar app renders as a full-day block instead of a timed slot.
Local Processing
The file is generated entirely in your browser — none of your event details are sent to a server.
A Note on Time Zones
This tool writes "floating" local times — the event will show at the same clock time regardless of which time zone the recipient's calendar app is set to, which is the simplest and most predictable behavior for a single-time-zone event. For attendees across different time zones, most calendar apps will still interpret the time correctly if everyone shares the same local time zone as the organizer.
Key Takeaways
- iCalendar (RFC 5545) Format: Generates a standards-compliant VEVENT block wrapped in a VCALENDAR.
- Title and Start Time Required: End time defaults to one hour after the start if left blank.
- Client-Side Only: Your event details never leave your browser.