ICS Generator API

Utilities

Free ICS calendar generator. Create event files compatible with Google Calendar, Outlook, and Apple Calendar.

Authentication

All API requests require a valid API key passed in the Authorization header as a Bearer token.

Rate Limit

100 requests per minute

Endpoints

1 endpoint available

Overview

The ICS Generator API creates iCalendar (.ics) files programmatically. Generate calendar event files that are compatible with Google Calendar, Microsoft Outlook, Apple Calendar, and all major calendar applications.

What You Get

The API returns a properly formatted ICS file containing:

VEVENT - A complete calendar event with all details
Universal Compatibility - Works with all major calendar platforms
RFC 5545 Compliant - Follows the iCalendar standard

Supported Fields

summary - Event title/name
description - Detailed event description
location - Physical or virtual location
start/end - Event start and end times (ISO 8601 format)
uid - Unique identifier (auto-generated if not provided)

Use Cases

Automated event invitations from booking systems
Conference and webinar registration confirmations
Appointment scheduling applications
Project management and deadline reminders
Email campaigns with calendar integrations

Endpoints

POST

/v1/tools/ics-generator

Generate an ICS calendar file

Request Body

Content-Type: application/json

Parameter	Type	Required	Description
summary	string	Required	Event title/name
description	string	Optional	Detailed event description
location	string	Optional	Event location (physical address or virtual meeting link)
start	string	Required	Start date/time in ISO 8601 format (e.g., "2025-11-06T15:00")
end	string	Required	End date/time in ISO 8601 format (e.g., "2025-11-06T16:00")
uid	string	Optional	Unique event identifier (auto-generated if not provided)

Response Example

{
  "success": true,
  "icsContent": "BEGIN:VCALENDAR\\nVERSION:2.0\\nPRODID:-//OpenToolsHub//ICS Generator//EN\\nBEGIN:VEVENT\\nUID:abc123@opentools.ca\\nDTSTAMP:20251106T120000Z\\nDTSTART:20251106T150000Z\\nDTEND:20251106T160000Z\\nSUMMARY:Project Meeting\\nDESCRIPTION:Discuss sprint progress\\nLOCATION:Zoom\\nEND:VEVENT\\nEND:VCALENDAR",
  "filename": "event.ics"
}

Error Codes

400

Invalid request body or missing required fields

401

Missing or invalid API key

422

Invalid date format

429

Rate limit exceeded

500

Internal server error

Code Examples

curl -X POST https://api.opentools.ca/v1/tools/ics-generator \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "summary": "Project Meeting",
    "description": "Discuss sprint progress and blockers",
    "location": "Zoom",
    "start": "2025-11-06T15:00",
    "end": "2025-11-06T16:00"
  }'

Ready to get started?

Create an API key to start using the ICS Generator API.