ICS Calendar Event Generator
Create a calendar event and download a standard .ics (iCalendar) file you can add to Google Calendar, Outlook, or Apple Calendar. All in your browser.
Pure browser JavaScript — builds the standard iCalendar (RFC 5545) format; no third-party library.
How to use this tool
- Enter the event title, start and end date/time, location, and description.
- Tick All-day for a date-only event if you prefer.
- Click Download .ics and open the file to add it to your calendar.
An .ics file (iCalendar) is the universal calendar-event format accepted by Google Calendar, Outlook, and Apple Calendar. Enter a title, start/end date and time (or mark it all-day), a location, and a description, then download a ready-to-import event. Text is escaped per RFC 5545.
How it works
The ICS Calendar Event Generator creates a standard .ics (iCalendar) file you can open in any calendar application. Enter the event title, start and end date/time, location, and an optional description, then click Download. Opening the .ics file adds the event to your calendar in a single click.
The iCalendar format is supported by Google Calendar, Apple Calendar, Microsoft Outlook, Thunderbird, and virtually every other calendar application. It is the universal standard for sharing individual events outside of a scheduling platform.
This tool is ideal for embedding calendar invitations in emails, creating shareable event files for websites, or quickly adding a one-time event to your calendar without navigating through your calendar app's interface. Everything runs in your browser -- no data is sent to any server.
Note that .ics files created here are single-occurrence events. Recurring events with complex rules (weekly, monthly, etc.) are beyond the scope of this basic generator.
Worked example
Create a calendar invite for a webinar
- Enter the event title (e.g., Q3 Product Webinar).
- Set the start date and time (e.g., July 15, 2025 at 2:00 PM).
- Set the end time (e.g., 3:00 PM).
- Add the Zoom link or meeting room in the Location field.
- Click Download .ics and attach the file to your invitation email.
Recipients open the .ics attachment and their calendar app prompts them to add the event, complete with title, time, and location.
Common mistakes to avoid
- Setting the end time before or equal to the start time, which produces an invalid event that some calendar apps will reject.
- Forgetting timezone context when sharing across regions -- 2:00 PM local time to you may be a different hour for attendees in other timezones.
- Not including a location or meeting link, leaving attendees without the information they need to join.
Key terms
- iCalendar (.ics)
- An open standard file format for calendar event data; universally supported by calendar apps on all platforms.
- DTSTART / DTEND
- iCalendar fields that define the event start and end date-times in the UTC or local timezone format.
- UID
- A unique identifier generated for each calendar event to prevent duplicate entries when the file is imported more than once.
Frequently asked questions
- Which calendars support .ics?
- Google Calendar, Microsoft Outlook, and Apple Calendar all import iCalendar (.ics) files.
- Is my event uploaded?
- No — the .ics file is generated locally in your browser.